[Solved] "Lock" the UI while waiting on an async event?

[ZapB]

You also have to block QEvent::ContextMenu event types to stop context menus appearing.

So can you only consume MousePress but not MouseRelease?

[reactive]

So can you only consume MousePress but not MouseRelease?

Well, the text box cursors move on mouse presses and the popup menu appears
on mouse release (in a text box) - so somehow text boxes are getting around
the mouse event filter.

I can't even guess at the button behavior, but it must somehow still knows you're clicking on it too.