Fix assertion failure in QCompleter::setCompletionPrefix().

Calling setCompletionPrefix() on a QCompleter from a slot connected
to the editingFinished() signal of the corresponding QLineEdit
could in some cases alter the internal state of the completer in
such a way that an assertion would fail. The fix prevents the
asserting code from being called in this particular state.

Reviewed-by: janarve
Task-number: 246056

1 files changed, 2 insertions, 2 deletions

diff --git a/src/gui/util/qcompleter.cpp b/src/gui/util/qcompleter.cpp
index 8b07163..aeb7e91 100644
--- a/src/gui/util/qcompleter.cpp
+++ b/src/gui/util/qcompleter.cpp
@@ -824,9 +824,9 @@ void QCompleterPrivate::_q_complete(QModelIndex index, bool highlighted)
     Q_Q(QCompleter);
     QString completion;
 
-    if (!index.isValid())
+    if (!index.isValid() || (index.row() >= proxy->engine->matchCount())) {
         completion = prefix;
-    else {
+    } else {
         QModelIndex si = proxy->mapToSource(index);
         si = si.sibling(si.row(), column); // for clicked()
         completion = q->pathFromIndex(si);