When a QCompleter is added to a QTextEdit, which is then added to a QGraphicsScene, the QCompleter does not function as it does when within a normal Widget. The completer dialog seems to popup as designed, but the dialog only appears on odd quantities of key presses. When the count of key presses is even, the dialog box disappears, which seems to imply a focus issue.

Example, when completing the word "One".

Type "O", dialog appears. Type "n", the dialog disappears". Type "e", the dialog reappears.

Reproduce: Open the "Custom Completer Example", add a QGraphicsView and QGraphicsScene in constructor of MainWindow class, instead of adding the completingTextEdit as centralWidget, add it to the graphics scene