Possible Bugfix in MappingEditWidget

SheMov crashed in MappingEditWidget::removeMapping, maybe because of
some race. So turn the selected QModelIndex into a PersistentModelIndex
and check for validity before removing the row...

1 files changed, 4 insertions, 2 deletions

diff --git a/mappingtreewidget.cpp b/mappingtreewidget.cpp
index 39bece7..8522f8b 100644
--- a/mappingtreewidget.cpp
+++ b/mappingtreewidget.cpp
@@ -310,8 +310,10 @@ void MappingEditWidget::removeMapping(){
     if(sel.isEmpty()){
         return;
     }
-    QModelIndex firstIdx = sel.first();
-    mResultModel->removeRows(firstIdx.row(), 1, firstIdx.parent());
+    QPersistentModelIndex firstIdx = sel.first();
+    if(firstIdx.isValid()){
+        mResultModel->removeRows(firstIdx.row(), 1, firstIdx.parent());
+    }
 }
 
 void MappingEditWidget::setMappings(const QList<MappingData> &mappings){