QKeyEvent not send on linux for composed characters

When doing ^ then e, we should have one Keys.onPressed event for ê with event.text=ê but there is none.

On the console, event.text for "simple" (keys are in the French keyboard for example) accentued characters (é, ù...) is "?" and not the wanted one.

I don't know if both issues are related so I can open a second one to dissociate if needed.

It seems to work fine on Windows but not on linux and I can't test for mac.