QSortFilterProxyModel: Fix dynamic sorting when severals rows are added.

We need to update the sorting column in clear_mapping.
But the problem is that updating the source column create a mapping
(because it uses mapToSource). So we need to clear that wrong mapping again

In _q_sourceLayoutChanged there was an uneeded special case.
The case where the source_sort_column might change was never triggered
because of that. So now that the special case has been removed, we need
to do as in clear_mapping.

The test cover the change in clear_mapping and in _q_sourceLayoutChanged

The problem was shown in the Kopete: https://bugs.kde.org/show_bug.cgi?id=199850

Reviewed-by: Thierry
Task-number: QTBUG-7537

1 files changed, 10 insertions, 6 deletions

diff --git a/src/gui/itemviews/qsortfilterproxymodel.cpp b/src/gui/itemviews/qsortfilterproxymodel.cpp
index 472af7d..e73013c 100644
--- a/src/gui/itemviews/qsortfilterproxymodel.cpp
+++ b/src/gui/itemviews/qsortfilterproxymodel.cpp
@@ -270,6 +270,11 @@ void QSortFilterProxyModelPrivate::clear_mapping()
 
     qDeleteAll(source_index_mapping);
     source_index_mapping.clear();
+    if (dynamic_sortfilter && update_source_sort_column()) {
+        //update_source_sort_column might have created wrong mapping so we have to clear it again
+        qDeleteAll(source_index_mapping);
+        source_index_mapping.clear();
+    }
 
     // update the persistent indexes
     update_persistent_indexes(source_indexes);
@@ -1208,11 +1213,6 @@ void QSortFilterProxyModelPrivate::_q_sourceLayoutAboutToBeChanged()
 void QSortFilterProxyModelPrivate::_q_sourceLayoutChanged()
 {
     Q_Q(QSortFilterProxyModel);
-    if (saved_persistent_indexes.isEmpty()) {
-        clear_mapping();
-        emit q->layoutChanged();
-        return;
-    }
 
     qDeleteAll(source_index_mapping);
     source_index_mapping.clear();
@@ -1220,7 +1220,11 @@ void QSortFilterProxyModelPrivate::_q_sourceLayoutChanged()
     update_persistent_indexes(saved_persistent_indexes);
     saved_persistent_indexes.clear();
 
-    update_source_sort_column();
+    if (dynamic_sortfilter && update_source_sort_column()) {
+        //update_source_sort_column might have created wrong mapping so we have to clear it again
+        qDeleteAll(source_index_mapping);
+        source_index_mapping.clear();
+    }
 
     emit q->layoutChanged();
 }