Prevent redundant replanning

Planning dives is heavy on CPU, so better be sure we only
do it when needed. In particular, when moving around dive
points, we only want a new plan once per move and not three
times (triggered at various points in the chain of events).

This should significantly improve planner snappiness.

Signed-off-by: Robert C. Helling <helling@atdotde.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/qt-models/cylindermodel.cpp b/qt-models/cylindermodel.cpp
index 3979b13b6..9f34007c7 100644
--- a/qt-models/cylindermodel.cpp
+++ b/qt-models/cylindermodel.cpp
@@ -648,6 +648,7 @@ bool CylindersModel::updateBestMixes()
 	}
 	/* This slot is called when the bottom pO2 and END preferences are updated, we want to
 	 * emit dataChanged so MOD and MND are refreshed, even if the gas mix hasn't been changed */
-	emit dataChanged(createIndex(0, 0), createIndex(MAX_CYLINDERS - 1, COLUMNS - 1));
+	if (gasUpdated)
+		emit dataChanged(createIndex(0, 0), createIndex(MAX_CYLINDERS - 1, COLUMNS - 1));
 	return gasUpdated;
 }