qt: Screen reader is broken with composition on X11 and Windows

When running VLC 4.x with composition the screen reader no longer works.

This happens on:

Ubuntu --qt-compositor=x11 with Orca (Settings > Universal Access > Screen Reader).
Window --qt-compositor=dcomp with the narrator.

When testing with --qt-compositor=dummy it works fine on Ubuntu 20.04 and Windows 10.

Edited Jul 28, 2022 by Benjamin Arnaud

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