Sketcher: restore constraint filter if Multiple dialog is canceled

src/Mod/Sketcher/Gui/TaskSketcherConstraints.cpp

@@ -583,7 +583,7 @@ void ConstraintView::centerSelectedItems()
 void ConstraintView::deleteSelectedItems()
 {
     App::Document* doc = App::GetApplication().getActiveDocument();
-    if (!doc)
+    if (!doc)
         return;
 
     doc->openTransaction("Delete constraint");
@@ -828,6 +828,11 @@ void TaskSketcherConstraints::on_multipleFilterButton_clicked(bool)
         // if tracking, it will call slotConstraintChanged via update mechanism as Multi Filter affects not only visibility, but also filtered list content, if not tracking will still update the list to match the multi-filter.
         updateList();
     }
+    else
+    {
+        // restore previous filter if Multiple filter dialog is canceled
+        ui->comboBoxFilter->setCurrentIndex(filterindex);
+    }
 }
 
 void TaskSketcherConstraints::on_settingsDialogButton_clicked(bool)
@@ -1140,7 +1145,7 @@ void TaskSketcherConstraints::on_listWidgetConstraints_itemSelectionChanged(void
 void TaskSketcherConstraints::on_listWidgetConstraints_itemActivated(QListWidgetItem *item)
 {
     ConstraintItem *it = dynamic_cast<ConstraintItem*>(item);
-    if (!it)
+    if (!it)
         return;
 
     // if its the right constraint
@@ -1155,7 +1160,7 @@ void TaskSketcherConstraints::on_listWidgetConstraints_updateDrivingStatus(QList
 {
     Q_UNUSED(status);
     ConstraintItem *citem = dynamic_cast<ConstraintItem*>(item);
-    if (!citem)
+    if (!citem)
         return;
 
     Gui::Application::Instance->commandManager().runCommandByName("Sketcher_ToggleDrivingConstraint");
@@ -1166,7 +1171,7 @@ void TaskSketcherConstraints::on_listWidgetConstraints_updateActiveStatus(QListW
 {
     Q_UNUSED(status);
     ConstraintItem *citem = dynamic_cast<ConstraintItem*>(item);
-    if (!citem)
+    if (!citem)
         return;
 
     Gui::Application::Instance->commandManager().runCommandByName("Sketcher_ToggleActiveConstraint");