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README: Add Qt sample for sending announcement event

Michael Weghorn requested to merge michaelweghorn/orca:michaelweghorn/add_qt_announcement_sample_to_readme into main

Similar to the existing GTK 3 and GTK 4 sample apps, add a small sample Qt app that demonstrates how to send a QAccessibleAnnouncementEvent, which is bridged to an AT-SPI "Announcement" event on Linux.

Qt API and bridging to AT-SPI were added in Qt commits [1] and [2] and will be contained in Qt >= 6.8:

commit 010952a55ee9ca9731f8ad15f2773d0bae645840
Author: Michael Weghorn <m.weghorn@posteo.de>
Date:   Tue Apr 9 16:43:21 2024 +0200

    a11y: Add new QAccessibleAnnouncementEvent

commit 24986ccb7b2020cbb574700a31667e88ed243194
Author: Michael Weghorn <m.weghorn@posteo.de>
Date:   Tue Apr 9 16:17:58 2024 +0200

    a11y atspi: Forward new QAccessibleAnnouncementEvent to AT-SPI

The corresponding Qt issue/feature request [3] contains a C++ sample app that can be run as is with the current qtbase git dev branch.

In order for the Python sample added to the README to work, PySide (the Qt Python bindings) also needs to be updated. Pending Gerrit change: [4]

[1] https://code.qt.io/cgit/qt/qtbase.git/commit/?id=010952a55ee9ca9731f8ad15f2773d0bae645840 [2] https://code.qt.io/cgit/qt/qtbase.git/commit/?id=24986ccb7b2020cbb574700a31667e88ed243194 [3] https://bugreports.qt.io/browse/QTBUG-75003 [4] https://codereview.qt-project.org/c/pyside/pyside-setup/+/561134

Fixes: #447 (closed)

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