CppEditor: quick fix to generate getters and setters

This does not take namespaces on the implementation side
into account and does not properly position/indent things.

Task-number: QTCREATORBUG-1890
Change-Id: I779d12fefc79521bce38361729d4f66dada71147
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/libs/utils/changeset.cpp

@@ -158,6 +158,8 @@ bool ChangeSet::move_helper(int pos, int length, int to)
 
 bool ChangeSet::insert(int pos, const QString &text)
 {
+    Q_ASSERT(pos >= 0);
+
     if (hasOverlap(pos, 0))
         m_error = true;