HistoryCompleter: Fix removeRows scope

Change-Id: Ia951c1e816a4c333ebf099d774405c41003c4966
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/libs/utils/historycompleter.cpp

@@ -129,7 +129,11 @@ QVariant HistoryCompleterPrivate::data(const QModelIndex &index, int role) const
 
 bool HistoryCompleterPrivate::removeRows(int row, int count, const QModelIndex &parent)
 {
-    beginRemoveRows (parent, row, row + count);
+    QTC_ASSERT(theSettings, return false);
+    if (row + count > list.count())
+        return false;
+    beginRemoveRows(parent, row, row + count -1);
+    for (int i = 0; i < count; ++i)
         list.removeAt(row);
     theSettings->setValue(historyKey, list);
     endRemoveRows();