Fix ambiguous shortcut problems

The dummy shortcut eater did not always work, we sometimes do have
mutual exclusive shortcuts in the same context.

The current solution is simpler: ignore text input when the control modifier
is used. This seems to be in line with other toolkits and applications.

Done with: thorbjorn

src/plugins/texteditor/basetexteditor.cpp

@@ -1176,7 +1176,7 @@ void BaseTextEditor::keyPressEvent(QKeyEvent *e)
 
     if (ro || e->text().isEmpty() || !e->text().at(0).isPrint()) {
         QPlainTextEdit::keyPressEvent(e);
-    } else {
+    } else if ((e->modifiers() & Qt::ControlModifier) != Qt::ControlModifier){
         QTextCursor cursor = textCursor();
         QString text = e->text();
         QString autoText = autoComplete(cursor, text);