Preferences UI: create new equipment tab

Remove the "Show unused cylinders" checkbox (Profile tab) and the
"Set default cylinder" qTextEdit box (General tab) and put them in a
separate and new Equipment tab. This sounds like a simple task but,
as can be seen from the files changed, was actually a complex matter.
Adapt the existing test programs (General and TechDetails) for creating
a test program that tests parts of the Equipment tab.

Signed-off-by: willemferguson <willemferguson@zoology.up.ac.za>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

25 files changed, 369 insertions, 105 deletions

diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index c8c457432..ce4e6027b 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -211,6 +211,8 @@ set(SUBSURFACE_CORE_LIB_SRCS
 	settings/qPrefUnit.h
 	settings/qPrefUpdateManager.cpp
 	settings/qPrefUpdateManager.h
+	settings/qPrefEquipment.cpp
+	settings/qPrefEquipment.h
 
 	#Subsurface Qt have the Subsurface structs QObjectified for easy access via QML.
 	subsurface-qt/CylinderObjectHelper.cpp
diff --git a/core/pref.h b/core/pref.h
index b02d9df99..1e8417af8 100644
--- a/core/pref.h
+++ b/core/pref.h
@@ -98,20 +98,23 @@ struct preferences {
 	dive_computer_prefs_t dive_computer3;
 	dive_computer_prefs_t dive_computer4;
 
-	// ********** Display **********
+	// ********** Display *************
 	bool        display_invalid_dives;
 	const char *divelist_font;
 	double      font_size;
 	double      mobile_scale;
 	bool        show_developer;
 
+	// ********** Equipment tab *******
+	const char *default_cylinder;
+	bool        display_unused_tanks;
+
 	// ********** General **********
 	bool        auto_recalculate_thumbnails;
 	bool	    extract_video_thumbnails;
 	int	    extract_video_thumbnails_position; // position in stream: 0=first 100=last second
 	const char *ffmpeg_executable; // path of ffmpeg binary
 	int         defaultsetpoint; // default setpoint in mbar
-	const char *default_cylinder;
 	const char *default_filename;
 	enum def_file_behavior default_file_behavior;
 	int         o2consumption; // ml per min
@@ -182,7 +185,6 @@ struct preferences {
 	bool                        decoinfo; // Show deco info in infobox
 	bool                        dcceiling;
 	enum deco_mode              display_deco_mode;
-	bool                        display_unused_tanks;
 	bool                        ead;
 	int                         gfhigh;
 	int                         gflow;
diff --git a/core/settings/qPref.cpp b/core/settings/qPref.cpp
index 4c4a7961c..c70ad4dbe 100644
--- a/core/settings/qPref.cpp
+++ b/core/settings/qPref.cpp
@@ -14,6 +14,7 @@
 #include "qPrefTechnicalDetails.h"
 #include "qPrefUnit.h"
 #include "qPrefUpdateManager.h"
+#include "qPrefEquipment.h"
 
 #include <QtQml>
 #include <QQmlContext>
@@ -38,6 +39,7 @@ void qPref::loadSync(bool doSync)
 	qPrefTechnicalDetails::loadSync(doSync);
 	qPrefUnits::loadSync(doSync);
 	qPrefUpdateManager::loadSync(doSync);
+	qPrefEquipment::loadSync(doSync);
 }
 
 Q_DECLARE_METATYPE(deco_mode);
@@ -61,6 +63,7 @@ void qPref::registerQML(QQmlEngine *engine)
 		ct->setContextProperty("PrefTechnicalDetails", qPrefTechnicalDetails::instance());
 		ct->setContextProperty("PrefUnits", qPrefUnits::instance());
 		ct->setContextProperty("PrefUpdateManager", qPrefUpdateManager::instance());
+		ct->setContextProperty("PrefEquipment", qPrefUpdateManager::instance());
 	}
 
 	// Register special types
diff --git a/core/settings/qPrefEquipment.cpp b/core/settings/qPrefEquipment.cpp
new file mode 100644
index 000000000..f7bdb01e1
--- /dev/null
+++ b/core/settings/qPrefEquipment.cpp
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "qPrefEquipment.h"
+#include "qPrefPrivate.h"
+
+static const QString group = QStringLiteral("Equipment");
+
+qPrefEquipment *qPrefEquipment::instance()
+{
+	static qPrefEquipment *self = new qPrefEquipment;
+	return self;
+}
+
+void qPrefEquipment::loadSync(bool doSync)
+{
+	disk_default_cylinder(doSync);
+	disk_display_unused_tanks(doSync);
+
+}
+
+HANDLE_PREFERENCE_TXT(Equipment, "default_cylinder", default_cylinder);
+HANDLE_PREFERENCE_BOOL(Equipment, "display_unused_tanks", display_unused_tanks);
+
diff --git a/core/settings/qPrefEquipment.h b/core/settings/qPrefEquipment.h
new file mode 100644
index 000000000..33fe9f8d6
--- /dev/null
+++ b/core/settings/qPrefEquipment.h
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef QPREFEQUIPMENT_H
+#define QPREFEQUIPMENT_H
+#include "core/pref.h"
+
+#include <QObject>
+
+class qPrefEquipment : public QObject {
+	Q_OBJECT
+	Q_PROPERTY(QString default_cylinder READ default_cylinder WRITE set_default_cylinder NOTIFY default_cylinderChanged)
+	Q_PROPERTY(bool display_unused_tanks READ display_unused_tanks WRITE set_display_unused_tanks NOTIFY display_unused_tanksChanged)
+
+public:
+	static qPrefEquipment *instance();
+
+	// Load/Sync local settings (disk) and struct preference
+	static void loadSync(bool doSync);
+	static void load() { loadSync(false); }
+	static void sync() { loadSync(true); }
+
+public:
+	static QString default_cylinder() { return prefs.default_cylinder; }
+	static bool display_unused_tanks() { return prefs.display_unused_tanks; }
+
+public slots:
+	static void set_default_cylinder(const QString& value);
+	static void set_display_unused_tanks(bool value);
+
+signals:
+	void default_cylinderChanged(const QString& value);
+	void display_unused_tanksChanged(bool value);
+
+private:
+	qPrefEquipment() {}
+	static void disk_default_cylinder(bool doSync);
+	static void disk_display_unused_tanks(bool doSync);
+};
+
+#endif
+
diff --git a/core/settings/qPrefGeneral.cpp b/core/settings/qPrefGeneral.cpp
index 766f5edbc..b3e9fb761 100644
--- a/core/settings/qPrefGeneral.cpp
+++ b/core/settings/qPrefGeneral.cpp
@@ -22,7 +22,6 @@ void qPrefGeneral::loadSync(bool doSync)
 {
 	disk_auto_recalculate_thumbnails(doSync);
 	disk_auto_recalculate_thumbnails(doSync);
-	disk_default_cylinder(doSync);
 	disk_default_filename(doSync);
 	disk_default_file_behavior(doSync);
 	disk_defaultsetpoint(doSync);
@@ -44,8 +43,6 @@ void qPrefGeneral::loadSync(bool doSync)
 
 HANDLE_PREFERENCE_BOOL(General, "auto_recalculate_thumbnails", auto_recalculate_thumbnails);
 
-HANDLE_PREFERENCE_TXT(General, "default_cylinder", default_cylinder);
-
 HANDLE_PREFERENCE_TXT(General, "default_filename", default_filename);
 
 
diff --git a/core/settings/qPrefGeneral.h b/core/settings/qPrefGeneral.h
index df45a56b8..c55063bd2 100644
--- a/core/settings/qPrefGeneral.h
+++ b/core/settings/qPrefGeneral.h
@@ -8,7 +8,6 @@
 class qPrefGeneral : public QObject {
 	Q_OBJECT
 	Q_PROPERTY(bool auto_recalculate_thumbnails READ auto_recalculate_thumbnails WRITE set_auto_recalculate_thumbnails NOTIFY auto_recalculate_thumbnailsChanged)
-	Q_PROPERTY(QString default_cylinder READ default_cylinder WRITE set_default_cylinder NOTIFY default_cylinderChanged)
 	Q_PROPERTY(QString default_filename READ default_filename WRITE set_default_filename NOTIFY default_filenameChanged)
 	Q_PROPERTY(enum def_file_behavior default_file_behavior READ default_file_behavior WRITE set_default_file_behavior NOTIFY default_file_behaviorChanged)
 	Q_PROPERTY(int defaultsetpoint READ defaultsetpoint WRITE set_defaultsetpoint NOTIFY defaultsetpointChanged)
@@ -35,7 +34,6 @@ public:
 
 public:
 	static bool auto_recalculate_thumbnails() { return prefs.auto_recalculate_thumbnails; }
-	static QString default_cylinder() { return prefs.default_cylinder; }
 	static QString default_filename() { return prefs.default_filename; }
 	static enum def_file_behavior default_file_behavior() { return prefs.default_file_behavior; }
 	static int defaultsetpoint() { return prefs.defaultsetpoint; }
@@ -53,7 +51,6 @@ public:
 
 public slots:
 	static void set_auto_recalculate_thumbnails(bool value);
-	static void set_default_cylinder(const QString& value);
 	static void set_default_filename(const QString& value);
 	static void set_default_file_behavior(enum def_file_behavior value);
 	static void set_defaultsetpoint(int value);
@@ -71,7 +68,6 @@ public slots:
 
 signals:
 	void auto_recalculate_thumbnailsChanged(bool value);
-	void default_cylinderChanged(const QString& value);
 	void default_filenameChanged(const QString& value);
 	void default_file_behaviorChanged(enum def_file_behavior value);
 	void defaultsetpointChanged(int value);
@@ -92,7 +88,6 @@ private:
 	qPrefGeneral() {}
 
 	static void disk_auto_recalculate_thumbnails(bool doSync);
-	static void disk_default_cylinder(bool doSync);
 	static void disk_default_filename(bool doSync);
 	static void disk_default_file_behavior(bool doSync);
 	static void disk_defaultsetpoint(bool doSync);
diff --git a/core/settings/qPrefTechnicalDetails.cpp b/core/settings/qPrefTechnicalDetails.cpp
index cfa6cae0e..1d0e30c0c 100644
--- a/core/settings/qPrefTechnicalDetails.cpp
+++ b/core/settings/qPrefTechnicalDetails.cpp
@@ -20,7 +20,6 @@ void qPrefTechnicalDetails::loadSync(bool doSync)
 	disk_calcndltts(doSync);
 	disk_dcceiling(doSync);
 	disk_display_deco_mode(doSync);
-	disk_display_unused_tanks(doSync);
 	disk_ead(doSync);
 	disk_gfhigh(doSync);
 	disk_gflow(doSync);
@@ -57,8 +56,6 @@ HANDLE_PREFERENCE_BOOL(TechnicalDetails, "dcceiling", dcceiling);
 
 HANDLE_PREFERENCE_ENUM(TechnicalDetails, deco_mode, "display_deco_mode", display_deco_mode);
 
-HANDLE_PREFERENCE_BOOL(TechnicalDetails, "display_unused_tanks", display_unused_tanks);
-
 HANDLE_PREFERENCE_BOOL(TechnicalDetails, "ead", ead);
 
 void qPrefTechnicalDetails::set_gfhigh(int value)
diff --git a/core/settings/qPrefTechnicalDetails.h b/core/settings/qPrefTechnicalDetails.h
index 68974e8bb..dfd477320 100644
--- a/core/settings/qPrefTechnicalDetails.h
+++ b/core/settings/qPrefTechnicalDetails.h
@@ -15,7 +15,6 @@ class qPrefTechnicalDetails : public QObject {
 	Q_PROPERTY(bool decoinfo READ decoinfo WRITE set_decoinfo NOTIFY decoinfoChanged)
 	Q_PROPERTY(bool dcceiling READ dcceiling WRITE set_dcceiling NOTIFY dcceilingChanged)
 	Q_PROPERTY(deco_mode display_deco_mode READ display_deco_mode WRITE set_display_deco_mode NOTIFY display_deco_modeChanged)
-	Q_PROPERTY(bool display_unused_tanks READ display_unused_tanks WRITE set_display_unused_tanks NOTIFY display_unused_tanksChanged)
 	Q_PROPERTY(bool ead READ ead WRITE set_ead NOTIFY eadChanged)
 	Q_PROPERTY(int gfhigh READ gfhigh WRITE set_gfhigh NOTIFY gfhighChanged)
 	Q_PROPERTY(int gflow READ gflow WRITE set_gflow NOTIFY gflowChanged)
@@ -53,7 +52,6 @@ public:
 	static bool decoinfo() { return prefs.decoinfo; }
 	static bool dcceiling() { return prefs.dcceiling; }
 	static deco_mode display_deco_mode() { return prefs.display_deco_mode; }
-	static bool display_unused_tanks() { return prefs.display_unused_tanks; }
 	static bool ead() { return prefs.ead; }
 	static int gfhigh() { return prefs.gfhigh; }
 	static int gflow() { return prefs.gflow; }
@@ -83,7 +81,6 @@ public slots:
 	static void set_decoinfo(bool value);
 	static void set_dcceiling(bool value);
 	static void set_display_deco_mode(deco_mode value);
-	static void set_display_unused_tanks(bool value);
 	static void set_ead(bool value);
 	static void set_gfhigh(int value);
 	static void set_gflow(int value);
@@ -113,7 +110,6 @@ signals:
 	void decoinfoChanged(bool value);
 	void dcceilingChanged(bool value);
 	void display_deco_modeChanged(deco_mode value);
-	void display_unused_tanksChanged(bool value);
 	void eadChanged(bool value);
 	void gfhighChanged(int value);
 	void gflowChanged(int value);
@@ -145,7 +141,6 @@ private:
 	static void disk_decoinfo(bool doSync);
 	static void disk_dcceiling(bool doSync);
 	static void disk_display_deco_mode(bool doSync);
-	static void disk_display_unused_tanks(bool doSync);
 	static void disk_ead(bool doSync);
 	static void disk_gfhigh(bool doSync);
 	static void disk_gflow(bool doSync);
diff --git a/desktop-widgets/preferences/CMakeLists.txt b/desktop-widgets/preferences/CMakeLists.txt
index 6f7f657cb..af6071934 100644
--- a/desktop-widgets/preferences/CMakeLists.txt
+++ b/desktop-widgets/preferences/CMakeLists.txt
@@ -12,6 +12,7 @@ set(SUBSURFACE_PREFERENCES_UI
   preferences_units.ui
   preferences_georeference.ui
   preferences_language.ui
+  preferences_equipment.ui
 )
 
 qt5_wrap_ui(SUBSURFACE_PREFERENCES_UI_HDRS ${SUBSURFACE_PREFERENCES_UI})
@@ -23,6 +24,8 @@ set(SUBSURFACE_PREFERENCES_LIB_SRCS
 	abstractpreferenceswidget.h
 	preferences_defaults.cpp
 	preferences_defaults.h
+	preferences_equipment.cpp
+	preferences_equipment.h
 	preferences_georeference.cpp
 	preferences_georeference.h
 	preferences_graph.cpp
diff --git a/desktop-widgets/preferences/preferences_defaults.cpp b/desktop-widgets/preferences/preferences_defaults.cpp
index f439b0702..e0df807b0 100644
--- a/desktop-widgets/preferences/preferences_defaults.cpp
+++ b/desktop-widgets/preferences/preferences_defaults.cpp
@@ -109,12 +109,6 @@ void PreferencesDefaults::refreshSettings()
 	ui->cloudDefaultFile->setChecked(qPrefGeneral::default_file_behavior() == CLOUD_DEFAULT_FILE);
 	ui->localDefaultFile->setChecked(qPrefGeneral::default_file_behavior() == LOCAL_DEFAULT_FILE);
 
-	ui->default_cylinder->clear();
-	for (int i = 0; i < MAX_TANK_INFO && tank_info[i].name != NULL; i++) {
-		ui->default_cylinder->addItem(tank_info[i].name);
-		if (qPrefGeneral::default_cylinder() == tank_info[i].name)
-			ui->default_cylinder->setCurrentIndex(i);
-	}
 	ui->displayinvalid->setChecked(qPrefDisplay::display_invalid_dives());
 	ui->velocitySlider->setValue(qPrefDisplay::animation_speed());
 	ui->btnUseDefaultFile->setChecked(qPrefGeneral::use_default_file());
@@ -145,7 +139,6 @@ void PreferencesDefaults::syncSettings()
 {
 	auto general = qPrefGeneral::instance();
 	general->set_default_filename(ui->defaultfilename->text());
-	general->set_default_cylinder(ui->default_cylinder->currentText());
 	general->set_use_default_file(ui->btnUseDefaultFile->isChecked());
 	if (ui->noDefaultFile->isChecked())
 		general->set_default_file_behavior(NO_DEFAULT_FILE);
diff --git a/desktop-widgets/preferences/preferences_defaults.ui b/desktop-widgets/preferences/preferences_defaults.ui
index b1538f33d..60b478206 100644
--- a/desktop-widgets/preferences/preferences_defaults.ui
+++ b/desktop-widgets/preferences/preferences_defaults.ui
@@ -142,38 +142,6 @@
     </widget>
    </item>
    <item>
-    <widget class="QGroupBox" name="groupBox_6">
-     <property name="title">
-      <string>Default cylinder</string>
-     </property>
-     <layout class="QFormLayout" name="formLayout_6">
-      <property name="horizontalSpacing">
-       <number>5</number>
-      </property>
-      <property name="verticalSpacing">
-       <number>5</number>
-      </property>
-      <property name="margin">
-       <number>5</number>
-      </property>
-      <item row="0" column="0">
-       <widget class="QLabel" name="label_11">
-        <property name="text">
-         <string>Use default cylinder</string>
-        </property>
-       </widget>
-      </item>
-      <item row="0" column="1">
-       <layout class="QHBoxLayout" name="horizontalLayout_3">
-        <item>
-         <widget class="QComboBox" name="default_cylinder"/>
-        </item>
-       </layout>
-      </item>
-     </layout>
-    </widget>
-   </item>
-   <item>
     <widget class="QGroupBox" name="groupBox_7">
      <property name="title">
       <string>Animations</string>
diff --git a/desktop-widgets/preferences/preferences_equipment.cpp b/desktop-widgets/preferences/preferences_equipment.cpp
new file mode 100644
index 000000000..a446a279b
--- /dev/null
+++ b/desktop-widgets/preferences/preferences_equipment.cpp
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "preferences_equipment.h"
+#include "ui_preferences_equipment.h"
+#include "core/settings/qPrefEquipment.h"
+#include "core/qthelper.h"
+#include "core/dive.h"
+
+#include <QApplication>
+#include <QMessageBox>
+#include <QSortFilterProxyModel>
+
+#include "qt-models/models.h"
+
+PreferencesEquipment::PreferencesEquipment() : AbstractPreferencesWidget(tr("Equipment"), QIcon(":preferences-equipment-icon"), 4)
+{
+	ui = new Ui::PreferencesEquipment();
+	ui->setupUi(this);
+}
+
+PreferencesEquipment::~PreferencesEquipment()
+{
+	delete ui;
+}
+
+void PreferencesEquipment::refreshSettings()
+{
+	ui->display_unused_tanks->setChecked(prefs.display_unused_tanks);
+	ui->default_cylinder->clear();
+	for (int i = 0; i < MAX_TANK_INFO && tank_info[i].name != NULL; i++) {
+		ui->default_cylinder->addItem(tank_info[i].name);
+		if (qPrefEquipment::default_cylinder() == tank_info[i].name)
+			ui->default_cylinder->setCurrentIndex(i);
+	}
+}
+
+void PreferencesEquipment::syncSettings()
+{
+	auto equipment = qPrefEquipment::instance();
+	qPrefEquipment::set_display_unused_tanks(ui->display_unused_tanks->isChecked());
+	equipment->set_default_cylinder(ui->default_cylinder->currentText());
+}
diff --git a/desktop-widgets/preferences/preferences_equipment.h b/desktop-widgets/preferences/preferences_equipment.h
new file mode 100644
index 000000000..09402aa00
--- /dev/null
+++ b/desktop-widgets/preferences/preferences_equipment.h
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef PREFERENCES_EQUIPMENT_H
+#define PREFERENCES_EQUIPMENT_H
+
+#include <QMap>
+#include "abstractpreferenceswidget.h"
+
+namespace Ui {
+	class PreferencesEquipment;
+}
+
+class PreferencesEquipment : public AbstractPreferencesWidget {
+	Q_OBJECT
+public:
+	PreferencesEquipment();
+	~PreferencesEquipment();
+	void refreshSettings() override;
+	void syncSettings() override;
+private:
+	Ui::PreferencesEquipment *ui;
+public slots:
+
+};
+
+#endif
diff --git a/desktop-widgets/preferences/preferences_equipment.ui b/desktop-widgets/preferences/preferences_equipment.ui
new file mode 100644
index 000000000..4526f9618
--- /dev/null
+++ b/desktop-widgets/preferences/preferences_equipment.ui
@@ -0,0 +1,93 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>PreferencesEquipment</class>
+ <widget class="QWidget" name="PreferencesEquipment">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>621</width>
+    <height>523</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+
+   <item>
+    <widget class="QLabel" name="label_cylinders">
+     <property name="enabled">
+      <bool>true</bool>
+     </property>
+     <property name="text">
+      <string>CYLINDERS</string>
+     </property>
+    </widget>
+   </item>
+
+   <item>
+    <widget class="QGroupBox" name="groupBox_6">
+     <property name="title">
+      <string>Default cylinder in the Cylinders table of the Equipment tab</string>
+     </property>
+     <layout class="QFormLayout" name="formLayout_6">
+      <property name="horizontalSpacing">
+       <number>5</number>
+      </property>
+      <property name="verticalSpacing">
+       <number>5</number>
+      </property>
+      <property name="margin">
+       <number>5</number>
+      </property>
+
+      <item row="0" column="0">
+       <widget class="QLabel" name="label_11">
+        <property name="text">
+         <string>Select a default cylinder</string>
+        </property>
+       </widget>
+      </item>
+
+      <item row="0" column="1">
+       <layout class="QHBoxLayout" name="horizontalLayout_3">
+        <item>
+         <widget class="QComboBox" name="default_cylinder"/>
+        </item>
+       </layout>
+      </item>
+
+     </layout>
+    </widget>
+   </item>
+
+   <item>
+    <widget class="QCheckBox" name="display_unused_tanks">
+     <property name="text">
+      <string>Show unused cylinders in the Cylinders table of the Equipment tab</string>
+     </property>
+    </widget>
+   </item>
+
+   <item>
+    <spacer name="verticalSpacer">
+     <property name="orientation">
+      <enum>Qt::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>20</width>
+       <height>40</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
+
+
+  </layout>
+ </widget>
+
+ <resources/>
+ <connections/>
+</ui>
diff --git a/desktop-widgets/preferences/preferences_graph.cpp b/desktop-widgets/preferences/preferences_graph.cpp
index 74c248dc4..54a63fd71 100644
--- a/desktop-widgets/preferences/preferences_graph.cpp
+++ b/desktop-widgets/preferences/preferences_graph.cpp
@@ -49,7 +49,6 @@ void PreferencesGraph::refreshSettings()
 	ui->psro2rate->setValue(prefs.o2consumption / 1000.0);
 	ui->pscrfactor->setValue(lrint(1000.0 / prefs.pscr_ratio));
 
-	ui->display_unused_tanks->setChecked(prefs.display_unused_tanks);
 	ui->show_average_depth->setChecked(prefs.show_average_depth);
 	ui->auto_recalculate_thumbnails->setChecked(prefs.auto_recalculate_thumbnails);
 	ui->show_icd->setChecked(prefs.show_icd);
@@ -78,7 +77,6 @@ void PreferencesGraph::syncSettings()
 	qPrefTechnicalDetails::set_show_ccr_setpoint(ui->show_ccr_setpoint->isChecked());
 	qPrefTechnicalDetails::set_show_ccr_sensors(ui->show_ccr_sensors->isChecked());
 	qPrefTechnicalDetails::set_show_scr_ocpo2(ui->show_scr_ocpo2->isChecked());
-	qPrefTechnicalDetails::set_display_unused_tanks(ui->display_unused_tanks->isChecked());
 	qPrefTechnicalDetails::set_show_average_depth(ui->show_average_depth->isChecked());
 	qPrefTechnicalDetails::set_show_icd(ui->show_icd->isChecked());
 	qPrefTechnicalDetails::set_display_deco_mode(ui->vpmb->isChecked() ? VPMB : BUEHLMANN);
diff --git a/desktop-widgets/preferences/preferences_graph.ui b/desktop-widgets/preferences/preferences_graph.ui
index b70a5ff29..ab7e12f87 100644
--- a/desktop-widgets/preferences/preferences_graph.ui
+++ b/desktop-widgets/preferences/preferences_graph.ui
@@ -355,20 +355,13 @@
      </property>
      <layout class="QGridLayout" name="gridLayout_2">
       <item row="0" column="0" colspan="2">
-       <widget class="QCheckBox" name="display_unused_tanks">
-        <property name="text">
-         <string>Show unused cylinders in Equipment tab</string>
-        </property>
-       </widget>
-      </item>
-      <item row="1" column="0" colspan="2">
        <widget class="QCheckBox" name="show_average_depth">
         <property name="text">
          <string>Show mean depth in Profile</string>
         </property>
        </widget>
       </item>
-      <item row="2" column="0" colspan="2">
+      <item row="1" column="0" colspan="2">
        <widget class="QCheckBox" name="auto_recalculate_thumbnails">
         <property name="text">
          <string>Recalculate thumbnails if older than media file</string>
diff --git a/desktop-widgets/preferences/preferencesdialog.cpp b/desktop-widgets/preferences/preferencesdialog.cpp
index 9e1e6a7bf..508321ac5 100644
--- a/desktop-widgets/preferences/preferencesdialog.cpp
+++ b/desktop-widgets/preferences/preferencesdialog.cpp
@@ -9,6 +9,7 @@
 #include "preferences_graph.h"
 #include "preferences_network.h"
 #include "preferences_cloud.h"
+#include "preferences_equipment.h"
 
 #include "core/qthelper.h"
 
@@ -67,6 +68,7 @@ PreferencesDialog::PreferencesDialog()
 	addPreferencePage(new PreferencesGraph());
 	addPreferencePage(new PreferencesNetwork());
 	addPreferencePage(new PreferencesCloud());
+	addPreferencePage(new PreferencesEquipment());
 	refreshPages();
 
 	connect(pagesList, &QListWidget::currentRowChanged,
diff --git a/icons/pref_equipment.png b/icons/pref_equipment.png
new file mode 100644
index 000000000..67bf29b3c
--- /dev/null
+++ b/icons/pref_equipment.png
diff --git a/subsurface.qrc b/subsurface.qrc
index da108a8df..c360b5944 100644
--- a/subsurface.qrc
+++ b/subsurface.qrc
@@ -13,6 +13,7 @@
         <file alias="advanced-icon">icons/advanced.png</file>
         <file alias="preferences-system-network-icon">icons/network.png</file>
         <file alias="preferences-cloud-icon">icons/pref_cloud.png</file>
+        <file alias="preferences-equipment-icon">icons/pref_equipment.png</file>
         <file alias="scale-graph-icon">icons/graph.png</file>
         <file alias="value-minimum-icon">icons/minimum.png</file>
         <file alias="value-maximum-icon">icons/maximum.png</file>
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 887e1b34d..07452f7a1 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -110,6 +110,7 @@ TEST(TestQPrefDisplay testqPrefDisplay.cpp)
 TEST(TestQPrefDiveComputer testqPrefDiveComputer.cpp)
 TEST(TestQPrefDivePlanner testqPrefDivePlanner.cpp)
 TEST(TestQPrefGeneral testqPrefGeneral.cpp)
+TEST(TestQPrefEquipment testqPrefEquipment.cpp)
 TEST(TestQPrefGeocoding testqPrefGeocoding.cpp)
 TEST(TestQPrefLanguage testqPrefLanguage.cpp)
 TEST(TestQPrefLocationService testqPrefLocationService.cpp)
@@ -141,6 +142,7 @@ add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND}
 	TestQPrefDiveComputer
 	TestQPrefDivePlanner
 	TestQPrefGeneral
+	TestQPrefEquipment
 	TestQPrefGeocoding
 	TestQPrefLanguage
 	TestQPrefLocationService
diff --git a/tests/testqPrefEquipment.cpp b/tests/testqPrefEquipment.cpp
new file mode 100644
index 000000000..29d1baccb
--- /dev/null
+++ b/tests/testqPrefEquipment.cpp
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "testqPrefEquipment.h"
+
+#include "core/pref.h"
+#include "core/qthelper.h"
+#include "core/settings/qPrefEquipment.h"
+#include "core/settings/qPref.h"
+
+#include <QTest>
+#include <QSignalSpy>
+
+void TestQPrefEquipment::initTestCase()
+{
+	QCoreApplication::setOrganizationName("Subsurface");
+	QCoreApplication::setOrganizationDomain("subsurface.hohndel.org");
+	QCoreApplication::setApplicationName("SubsurfaceTestQPrefEquipment");
+	qPref::registerQML(NULL);
+}
+
+void TestQPrefEquipment::test_struct_get()
+{
+	// Test struct pref -> get func.
+
+	auto tst = qPrefEquipment::instance();
+	prefs.default_cylinder = copy_qstring("new base11");
+	QCOMPARE(tst->default_cylinder(), QString(prefs.default_cylinder));
+	prefs.display_unused_tanks = true;
+	QCOMPARE(tst->display_unused_tanks(), prefs.display_unused_tanks);
+}
+
+void TestQPrefEquipment::test_set_struct()
+{
+	// Test set func -> struct pref
+
+	auto tst = qPrefEquipment::instance();
+	tst->set_default_cylinder("new base21");
+	QCOMPARE(QString(prefs.default_cylinder), QString("new base21"));
+	tst->set_display_unused_tanks(false);
+	QCOMPARE(prefs.display_unused_tanks, false);
+}
+
+void TestQPrefEquipment::test_set_load_struct()
+{
+	// test set func -> load -> struct pref
+
+	auto tst = qPrefEquipment::instance();
+
+	tst->set_default_cylinder("new base31");
+	prefs.default_cylinder = copy_qstring("error");
+	tst->set_display_unused_tanks(false);
+	prefs.display_unused_tanks = true;
+	tst->load();
+	QCOMPARE(QString(prefs.default_cylinder), QString("new base31"));
+	QCOMPARE(prefs.display_unused_tanks, false);
+}
+
+void TestQPrefEquipment::test_struct_disk()
+{
+	// test struct prefs -> disk
+
+	auto tst = qPrefEquipment::instance();
+	prefs.default_cylinder = copy_qstring("base41");
+	prefs.display_unused_tanks = true;
+
+	tst->sync();
+	prefs.default_cylinder = copy_qstring("error");
+	prefs.display_unused_tanks = false;
+
+	tst->load();
+	QCOMPARE(QString(prefs.default_cylinder), QString("base41"));
+	QCOMPARE(prefs.display_unused_tanks, true);
+
+}
+
+#define TEST(METHOD, VALUE)      \
+	QCOMPARE(METHOD, VALUE); \
+	equipment->sync();           \
+	equipment->load();           \
+	QCOMPARE(METHOD, VALUE);
+
+void TestQPrefEquipment::test_oldPreferences()
+{
+	auto equipment = qPrefEquipment::instance();
+	equipment->set_default_cylinder("cylinder_2");
+	TEST(equipment->default_cylinder(), QStringLiteral("cylinder_2"));
+	equipment->set_default_cylinder("cylinder_1");
+	TEST(equipment->default_cylinder(), QStringLiteral("cylinder_1"));
+	equipment->set_display_unused_tanks(true);
+	TEST(equipment->display_unused_tanks(), true);
+	equipment->set_display_unused_tanks(false);
+	TEST(equipment->display_unused_tanks(), false);
+}
+
+void TestQPrefEquipment::test_signals()
+{
+	QSignalSpy spy1(qPrefEquipment::instance(), &qPrefEquipment::default_cylinderChanged);
+	QSignalSpy spy2(qPrefEquipment::instance(), &qPrefEquipment::display_unused_tanksChanged);
+
+	qPrefEquipment::set_default_cylinder("new base21");
+	QCOMPARE(spy1.count(), 1);
+	QVERIFY(spy1.takeFirst().at(0).toBool() == false);
+
+	prefs.display_unused_tanks = true;
+	qPrefEquipment::set_display_unused_tanks(false);
+	QCOMPARE(spy2.count(), 1);
+	QVERIFY(spy2.takeFirst().at(0).toBool() == false);
+}
+
+QTEST_MAIN(TestQPrefEquipment)
diff --git a/tests/testqPrefEquipment.h b/tests/testqPrefEquipment.h
new file mode 100644
index 000000000..b9a4bcee2
--- /dev/null
+++ b/tests/testqPrefEquipment.h
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef TESTQPREFEQUIPMENT_H
+#define TESTQPREFEQUIPMENT_H
+
+#include <QObject>
+
+class TestQPrefEquipment : public QObject {
+	Q_OBJECT
+
+private slots:
+	void initTestCase();
+	void test_struct_get();
+	void test_set_struct();
+	void test_set_load_struct();
+	void test_struct_disk();
+	void test_oldPreferences();
+	void test_signals();
+};
+
+#endif // TESTQPREFEQUIPMENT_H
diff --git a/tests/testqPrefGeneral.cpp b/tests/testqPrefGeneral.cpp
index 29ff6a811..1463b914b 100644
--- a/tests/testqPrefGeneral.cpp
+++ b/tests/testqPrefGeneral.cpp
@@ -24,7 +24,6 @@ void TestQPrefGeneral::test_struct_get()
 	auto tst = qPrefGeneral::instance();
 
 	prefs.auto_recalculate_thumbnails = true;
-	prefs.default_cylinder = copy_qstring("new base11");
 	prefs.default_filename = copy_qstring("new base12");
 	prefs.default_file_behavior = UNDEFINED_DEFAULT_FILE;
 	prefs.defaultsetpoint = 14;
@@ -36,7 +35,6 @@ void TestQPrefGeneral::test_struct_get()
 	prefs.use_default_file = true;
 
 	QCOMPARE(tst->auto_recalculate_thumbnails(), prefs.auto_recalculate_thumbnails);
-	QCOMPARE(tst->default_cylinder(), QString(prefs.default_cylinder));
 	QCOMPARE(tst->default_filename(), QString(prefs.default_filename));
 	QCOMPARE(tst->default_file_behavior(), prefs.default_file_behavior);
 	QCOMPARE(tst->defaultsetpoint(), prefs.defaultsetpoint);
@@ -55,7 +53,6 @@ void TestQPrefGeneral::test_set_struct()
 	auto tst = qPrefGeneral::instance();
 
 	tst->set_auto_recalculate_thumbnails(false);
-	tst->set_default_cylinder("new base21");
 	tst->set_default_filename("new base22");
 	tst->set_default_file_behavior(LOCAL_DEFAULT_FILE);
 	tst->set_defaultsetpoint(24);
@@ -69,7 +66,6 @@ void TestQPrefGeneral::test_set_struct()
 	tst->set_diveshareExport_private(false);
 
 	QCOMPARE(prefs.auto_recalculate_thumbnails, false);
-	QCOMPARE(QString(prefs.default_cylinder), QString("new base21"));
 	QCOMPARE(QString(prefs.default_filename), QString("new base22"));
 	QCOMPARE(prefs.default_file_behavior, LOCAL_DEFAULT_FILE);
 	QCOMPARE(prefs.defaultsetpoint, 24);
@@ -90,7 +86,6 @@ void TestQPrefGeneral::test_set_load_struct()
 	auto tst = qPrefGeneral::instance();
 
 	tst->set_auto_recalculate_thumbnails(true);
-	tst->set_default_cylinder("new base31");
 	tst->set_default_filename("new base32");
 	tst->set_default_file_behavior(NO_DEFAULT_FILE);
 	tst->set_defaultsetpoint(34);
@@ -104,7 +99,6 @@ void TestQPrefGeneral::test_set_load_struct()
 	tst->set_diveshareExport_private(true);
 
 	prefs.auto_recalculate_thumbnails = false;
-	prefs.default_cylinder = copy_qstring("error");
 	prefs.default_filename = copy_qstring("error");
 	prefs.default_file_behavior = UNDEFINED_DEFAULT_FILE;
 	prefs.defaultsetpoint = 14;
@@ -117,7 +111,6 @@ void TestQPrefGeneral::test_set_load_struct()
 
 	tst->load();
 	QCOMPARE(prefs.auto_recalculate_thumbnails, true);
-	QCOMPARE(QString(prefs.default_cylinder), QString("new base31"));
 	QCOMPARE(QString(prefs.default_filename), QString("new base32"));
 	QCOMPARE(prefs.default_file_behavior, NO_DEFAULT_FILE);
 	QCOMPARE(prefs.defaultsetpoint, 34);
@@ -138,7 +131,6 @@ void TestQPrefGeneral::test_struct_disk()
 	auto tst = qPrefGeneral::instance();
 
 	prefs.auto_recalculate_thumbnails = true;
-	prefs.default_cylinder = copy_qstring("base41");
 	prefs.default_filename = copy_qstring("base42");
 	prefs.default_file_behavior = CLOUD_DEFAULT_FILE;
 	prefs.defaultsetpoint = 44;
@@ -151,7 +143,6 @@ void TestQPrefGeneral::test_struct_disk()
 
 	tst->sync();
 	prefs.auto_recalculate_thumbnails = false;
-	prefs.default_cylinder = copy_qstring("error");
 	prefs.default_filename = copy_qstring("error");
 	prefs.default_file_behavior = UNDEFINED_DEFAULT_FILE;
 	prefs.defaultsetpoint = 14;
@@ -164,7 +155,6 @@ void TestQPrefGeneral::test_struct_disk()
 
 	tst->load();
 	QCOMPARE(prefs.auto_recalculate_thumbnails, true);
-	QCOMPARE(QString(prefs.default_cylinder), QString("base41"));
 	QCOMPARE(QString(prefs.default_filename), QString("base42"));
 	QCOMPARE(prefs.default_file_behavior, CLOUD_DEFAULT_FILE);
 	QCOMPARE(prefs.defaultsetpoint, 44);
@@ -201,7 +191,6 @@ void TestQPrefGeneral::test_oldPreferences()
 	auto general = qPrefGeneral::instance();
 
 	general->set_default_filename("filename");
-	general->set_default_cylinder("cylinder_2");
 	general->set_default_file_behavior(LOCAL_DEFAULT_FILE);
 	general->set_defaultsetpoint(0);
 	general->set_o2consumption(0);
@@ -209,7 +198,6 @@ void TestQPrefGeneral::test_oldPreferences()
 	general->set_use_default_file(true);
 
 	TEST(general->default_filename(), QStringLiteral("filename"));
-	TEST(general->default_cylinder(), QStringLiteral("cylinder_2"));
 	TEST(general->default_file_behavior(), LOCAL_DEFAULT_FILE); // since we have a default file, here it returns
 	TEST(general->defaultsetpoint(), 0);
 	TEST(general->o2consumption(), 0);
@@ -217,7 +205,6 @@ void TestQPrefGeneral::test_oldPreferences()
 	TEST(general->use_default_file(), true);
 
 	general->set_default_filename("no_file_name");
-	general->set_default_cylinder("cylinder_1");
 	//TODOl: Change this to a enum.
 	general->set_default_file_behavior(CLOUD_DEFAULT_FILE);
 
@@ -227,7 +214,6 @@ void TestQPrefGeneral::test_oldPreferences()
 	general->set_use_default_file(false);
 
 	TEST(general->default_filename(), QStringLiteral("no_file_name"));
-	TEST(general->default_cylinder(), QStringLiteral("cylinder_1"));
 	TEST(general->default_file_behavior(), CLOUD_DEFAULT_FILE);
 	TEST(general->defaultsetpoint(), 1);
 	TEST(general->o2consumption(), 1);
@@ -238,7 +224,6 @@ void TestQPrefGeneral::test_oldPreferences()
 void TestQPrefGeneral::test_signals()
 {
 	QSignalSpy spy1(qPrefGeneral::instance(), &qPrefGeneral::auto_recalculate_thumbnailsChanged);
-	QSignalSpy spy2(qPrefGeneral::instance(), &qPrefGeneral::default_cylinderChanged);
 	QSignalSpy spy3(qPrefGeneral::instance(), &qPrefGeneral::default_filenameChanged);
 	QSignalSpy spy4(qPrefGeneral::instance(), &qPrefGeneral::default_file_behaviorChanged);
 	QSignalSpy spy5(qPrefGeneral::instance(), &qPrefGeneral::defaultsetpointChanged);
@@ -254,7 +239,6 @@ void TestQPrefGeneral::test_signals()
 	prefs.auto_recalculate_thumbnails = true;
 	qPrefGeneral::set_auto_recalculate_thumbnails(false);
 
-	qPrefGeneral::set_default_cylinder("new base21");
 	qPrefGeneral::set_default_filename("new base22");
 	qPrefGeneral::set_default_file_behavior(LOCAL_DEFAULT_FILE);
 	qPrefGeneral::set_defaultsetpoint(24);
@@ -271,7 +255,6 @@ void TestQPrefGeneral::test_signals()
 
 	QVERIFY(spy1.takeFirst().at(0).toBool() == false);
 
-	qPrefGeneral::set_default_cylinder("new base21");
 	qPrefGeneral::set_default_filename("new base22");
 	qPrefGeneral::set_default_file_behavior(LOCAL_DEFAULT_FILE);
 	qPrefGeneral::set_defaultsetpoint(24);
@@ -285,5 +268,4 @@ void TestQPrefGeneral::test_signals()
 	qPrefGeneral::set_diveshareExport_private(false);
 }
 
-
 QTEST_MAIN(TestQPrefGeneral)
diff --git a/tests/testqPrefTechnicalDetails.cpp b/tests/testqPrefTechnicalDetails.cpp
index 9b6d88a45..b6272dbff 100644
--- a/tests/testqPrefTechnicalDetails.cpp
+++ b/tests/testqPrefTechnicalDetails.cpp
@@ -29,7 +29,6 @@ void TestQPrefTechnicalDetails::test_struct_get()
 	prefs.calcndltts = true;
 	prefs.dcceiling = true;
 	prefs.display_deco_mode = BUEHLMANN;
-	prefs.display_unused_tanks = true;
 	prefs.ead = true;
 	prefs.gfhigh = 27;
 	prefs.gflow = 25;
@@ -56,7 +55,6 @@ void TestQPrefTechnicalDetails::test_struct_get()
 	QCOMPARE(tst->calcndltts(), prefs.calcndltts);
 	QCOMPARE(tst->dcceiling(), prefs.dcceiling);
 	QCOMPARE(tst->display_deco_mode(), prefs.display_deco_mode);
-	QCOMPARE(tst->display_unused_tanks(), prefs.display_unused_tanks);
 	QCOMPARE(tst->ead(), prefs.ead);
 	QCOMPARE(tst->gfhigh(), prefs.gfhigh);
 	QCOMPARE(tst->gflow(), prefs.gflow);
@@ -91,7 +89,6 @@ void TestQPrefTechnicalDetails::test_set_struct()
 	tst->set_calcndltts(false);
 	tst->set_dcceiling(false);
 	tst->set_display_deco_mode(RECREATIONAL);
-	tst->set_display_unused_tanks(false);
 	tst->set_ead(false);
 	tst->set_gfhigh(29);
 	tst->set_gflow(24);
@@ -118,7 +115,6 @@ void TestQPrefTechnicalDetails::test_set_struct()
 	QCOMPARE(prefs.calcndltts, false);
 	QCOMPARE(prefs.dcceiling, false);
 	QCOMPARE(prefs.display_deco_mode, RECREATIONAL);
-	QCOMPARE(prefs.display_unused_tanks, false);
 	QCOMPARE(prefs.ead, false);
 	QCOMPARE(prefs.gfhigh, 29);
 	QCOMPARE(prefs.gflow, 24);
@@ -153,7 +149,6 @@ void TestQPrefTechnicalDetails::test_set_load_struct()
 	tst->set_calcndltts(false);
 	tst->set_dcceiling(true);
 	tst->set_display_deco_mode(RECREATIONAL);
-	tst->set_display_unused_tanks(false);
 	tst->set_ead(false);
 	tst->set_gfhigh(29);
 	tst->set_gflow(24);
@@ -181,7 +176,6 @@ void TestQPrefTechnicalDetails::test_set_load_struct()
 	prefs.calcndltts = true;
 	prefs.dcceiling = false;
 	prefs.display_deco_mode = BUEHLMANN;
-	prefs.display_unused_tanks = true;
 	prefs.ead = true;
 	prefs.gfhigh = 27;
 	prefs.gflow = 25;
@@ -209,7 +203,6 @@ void TestQPrefTechnicalDetails::test_set_load_struct()
 	QCOMPARE(prefs.calcndltts, false);
 	QCOMPARE(prefs.dcceiling, true);
 	QCOMPARE(prefs.display_deco_mode, RECREATIONAL);
-	QCOMPARE(prefs.display_unused_tanks, false);
 	QCOMPARE(prefs.ead, false);
 	QCOMPARE((int)prefs.gfhigh, 29);
 	QCOMPARE((int)prefs.gflow, 24);
@@ -244,7 +237,6 @@ void TestQPrefTechnicalDetails::test_struct_disk()
 	prefs.calcndltts = true;
 	prefs.dcceiling = true;
 	prefs.display_deco_mode = BUEHLMANN;
-	prefs.display_unused_tanks = true;
 	prefs.ead = true;
 	prefs.gfhigh = 11;
 	prefs.gflow = 12;
@@ -273,7 +265,6 @@ void TestQPrefTechnicalDetails::test_struct_disk()
 	prefs.calcndltts = false;
 	prefs.dcceiling = false;
 	prefs.display_deco_mode = RECREATIONAL;
-	prefs.display_unused_tanks = false;
 	prefs.ead = false;
 	prefs.gfhigh = 27;
 	prefs.gflow = 25;
@@ -301,7 +292,6 @@ void TestQPrefTechnicalDetails::test_struct_disk()
 	QCOMPARE(prefs.calcndltts, true);
 	QCOMPARE(prefs.dcceiling, true);
 	QCOMPARE(prefs.display_deco_mode, BUEHLMANN);
-	QCOMPARE(prefs.display_unused_tanks, true);
 	QCOMPARE(prefs.ead, true);
 	QCOMPARE(prefs.gfhigh, 11);
 	QCOMPARE(prefs.gflow, 12);
@@ -399,8 +389,6 @@ void TestQPrefTechnicalDetails::test_oldPreferences()
 	TEST(tecDetails->zoomed_plot(), true);
 	tecDetails->set_show_sac(true);
 	TEST(tecDetails->show_sac(), true);
-	tecDetails->set_display_unused_tanks(true);
-	TEST(tecDetails->display_unused_tanks(), true);
 	tecDetails->set_show_average_depth(true);
 	TEST(tecDetails->show_average_depth(), true);
 	tecDetails->set_show_pictures_in_profile(true);
@@ -438,8 +426,6 @@ void TestQPrefTechnicalDetails::test_oldPreferences()
 	TEST(tecDetails->zoomed_plot(), false);
 	tecDetails->set_show_sac(false);
 	TEST(tecDetails->show_sac(), false);
-	tecDetails->set_display_unused_tanks(false);
-	TEST(tecDetails->display_unused_tanks(), false);
 	tecDetails->set_show_average_depth(false);
 	TEST(tecDetails->show_average_depth(), false);
 	tecDetails->set_show_pictures_in_profile(false);
@@ -454,7 +440,6 @@ void TestQPrefTechnicalDetails::test_signals()
 	QSignalSpy spy4(qPrefTechnicalDetails::instance(), &qPrefTechnicalDetails::calcndlttsChanged);
 	QSignalSpy spy5(qPrefTechnicalDetails::instance(), &qPrefTechnicalDetails::dcceilingChanged);
 	QSignalSpy spy6(qPrefTechnicalDetails::instance(), &qPrefTechnicalDetails::display_deco_modeChanged);
-	QSignalSpy spy7(qPrefTechnicalDetails::instance(), &qPrefTechnicalDetails::display_unused_tanksChanged);
 	QSignalSpy spy8(qPrefTechnicalDetails::instance(), &qPrefTechnicalDetails::eadChanged);
 	QSignalSpy spy9(qPrefTechnicalDetails::instance(), &qPrefTechnicalDetails::gfhighChanged);
 	QSignalSpy spy10(qPrefTechnicalDetails::instance(), &qPrefTechnicalDetails::gflowChanged);
@@ -487,8 +472,6 @@ void TestQPrefTechnicalDetails::test_signals()
 	prefs.dcceiling = true;
 	qPrefTechnicalDetails::set_dcceiling(false);
 	qPrefTechnicalDetails::set_display_deco_mode(VPMB);
-	prefs.display_unused_tanks = true;
-	qPrefTechnicalDetails::set_display_unused_tanks(false);
 	prefs.ead = true;
 	qPrefTechnicalDetails::set_ead(false);
 	qPrefTechnicalDetails::set_gfhigh(-29);
@@ -532,7 +515,6 @@ void TestQPrefTechnicalDetails::test_signals()
 	QCOMPARE(spy4.count(), 1);
 	QCOMPARE(spy5.count(), 1);
 	QCOMPARE(spy6.count(), 1);
-	QCOMPARE(spy7.count(), 1);
 	QCOMPARE(spy8.count(), 1);
 	QCOMPARE(spy9.count(), 1);
 	QCOMPARE(spy10.count(), 1);
@@ -560,7 +542,6 @@ void TestQPrefTechnicalDetails::test_signals()
 	QVERIFY(spy4.takeFirst().at(0).toBool() == false);
 	QVERIFY(spy5.takeFirst().at(0).toBool() == false);
 	QVERIFY(spy6.takeFirst().at(0).toInt() == VPMB);
-	QVERIFY(spy7.takeFirst().at(0).toBool() == false);
 	QVERIFY(spy8.takeFirst().at(0).toBool() == false);
 	QVERIFY(spy9.takeFirst().at(0).toInt() == -29);
 	QVERIFY(spy10.takeFirst().at(0).toInt() == -24);