4 files changed, 28 insertions, 6 deletions

diff --git a/dive.h b/dive.h
index 277573f5b..f1570d31e 100644
--- a/dive.h
+++ b/dive.h
@@ -640,7 +640,6 @@ struct divedatapoint {
 
 struct diveplan {
 	timestamp_t when;
-	int lastdive_nr;
 	int surface_pressure; /* mbar */
 	int bottomsac;	/* ml/min */
 	int decosac;	  /* ml/min */
diff --git a/planner.c b/planner.c
index 2cc47258c..405b07e02 100644
--- a/planner.c
+++ b/planner.c
@@ -49,6 +49,20 @@ void dump_plan(struct diveplan *diveplan)
 }
 #endif
 
+bool diveplan_empty(struct diveplan *diveplan)
+{
+	struct divedatapoint *dp;
+	if (!diveplan || !diveplan->dp)
+		return true;
+	dp = diveplan->dp;
+	while(dp) {
+		if (dp->time)
+			return false;
+		dp = dp->next;
+	}
+	return true;
+}
+
 void set_last_stop(bool last_stop_6m)
 {
 	if (last_stop_6m == true)
diff --git a/planner.h b/planner.h
index 49f8be5ef..d5607a948 100644
--- a/planner.h
+++ b/planner.h
@@ -13,6 +13,7 @@ extern void show_planned_dive(char **error_string_p);
 extern void set_last_stop(bool last_stop_6m);
 extern void get_gas_from_events(struct divecomputer *dc, int time, int *o2, int *he);
 extern int get_gasidx(struct dive *dive, int o2, int he);
+extern bool diveplan_empty(struct diveplan *diveplan);
 
 extern struct dive *planned_dive;
 extern char *cache_data;
diff --git a/qt-ui/diveplanner.cpp b/qt-ui/diveplanner.cpp
index d11b89617..c73487048 100644
--- a/qt-ui/diveplanner.cpp
+++ b/qt-ui/diveplanner.cpp
@@ -388,6 +388,7 @@ bool DivePlannerPointsModel::setData(const QModelIndex &index, const QVariant &v
 {
 	int o2 = 0;
 	int he = 0;
+	int i, shift;
 	if (role == Qt::EditRole) {
 		divedatapoint &p = divepoints[index.row()];
 		switch (index.column()) {
@@ -398,10 +399,13 @@ bool DivePlannerPointsModel::setData(const QModelIndex &index, const QVariant &v
 			p.time = value.toInt() * 60;
 			break;
 		case DURATION:
-			if (index.row())
-				p.time = value.toInt() * 60 + divepoints[index.row() - 1].time;
+			i = index.row();
+			if (i)
+				shift = divepoints[i].time - divepoints[i - 1].time - value.toInt() * 60;
 			else
-				p.time = value.toInt() * 60;
+				shift = divepoints[i].time - value.toInt() * 60;
+			while (i < divepoints.size())
+				divepoints[i++].time -= shift;
 			break;
 		case CCSETPOINT: {
 			int po2 = 0;
@@ -445,7 +449,7 @@ QVariant DivePlannerPointsModel::headerData(int section, Qt::Orientation orienta
 
 Qt::ItemFlags DivePlannerPointsModel::flags(const QModelIndex &index) const
 {
-	if (index.column() != DURATION && index.column() != REMOVE)
+	if (index.column() != REMOVE)
 		return QAbstractItemModel::flags(index) | Qt::ItemIsEditable;
 	else
 		return QAbstractItemModel::flags(index);
@@ -764,6 +768,7 @@ void DivePlannerPointsModel::clear()
 	} else {
 		stagingDive = alloc_dive();
 	}
+	bool oldRecalc = setRecalc(false);
 	CylindersModel::instance()->setDive(stagingDive);
 	if (rowCount() > 0) {
 		beginRemoveRows(QModelIndex(), 0, rowCount() - 1);
@@ -771,12 +776,15 @@ void DivePlannerPointsModel::clear()
 		endRemoveRows();
 	}
 	CylindersModel::instance()->clear();
+	setRecalc(oldRecalc);
 }
 
 void DivePlannerPointsModel::addDecoToModel()
 {
 	struct divedatapoint *dp;
 
+	if (diveplan_empty(&diveplan))
+		return;
 	bool oldRecalc = plannerModel->setRecalc(false);
 	plannerModel->removeDeco();
 
@@ -832,7 +840,7 @@ void DivePlannerPointsModel::createTemporaryPlan()
 #if DEBUG_PLAN
 	dump_plan(&diveplan);
 #endif
-	if (plannerModel->recalcQ()) {
+	if (plannerModel->recalcQ() && !diveplan_empty(&diveplan)) {
 		plan(&diveplan, &cache, &tempDive, stagingDive, isPlanner());
 		addDecoToModel();
 		if (mode == ADD || mode == PLAN) {