gtk4 a11y: Report update to focused state HEADmaster

Recent GTK 4 upstream commits [1] [2]

commit 224e587cd30b9452eb19d3ec06f9f49ccd3c7cd0
Author: Emmanuele Bassi <ebassi@gnome.org>
Date:   Thu Feb 13 12:15:50 2025 +0000

a11y: Emit platform state changes on non widgets

GtkAccessible implementations are not necessarily widgets, so handle
platform states just like we do for any other state attribute.

Fixes: #6272

commit e7dfe11e6aa3513a661bfbe5028ad0d792a3fc9e
Author: Emmanuele Bassi <ebassi@gnome.org>
Date:   Thu Feb 13 12:09:18 2025 +0000

a11y: Add platform change notification method

Some GtkAccessible implementations have a concept of "platform state": a
state inherent to the toolkit, and not under user control. We already
allow accessible objects to provide that state when implementing the
GtkAccessible interface, but we have no way of communicating changes in
the platform state to assistive technologies.

See: #6272

introduced API that allows notifying of changes to
"platform states" for non-GtkWidget GtkAccessible implementations
This includes changes to the focused state.

Use that API to notify about changes to the FOCUSED
state.

This is essential for assistive technology like the
Orca screen reader, which announces the newly focused
object based on the corresponding object:state-changed:focused
AT-SPI event that gets emitted.

With this in place, Orca now e.g. announces the currently
focused toolbar button in Writer's toolbars when moving
focus between the items using the Tab key.

Focus changes between paragraphs in Writer are currently
still not announced reliably with the gtk4 VCL plugin,
which is probably due to another issue.

Orca now querying information for newly focused objects
was seen to (sometimes) trigger crashes when a Writer
paragraph gets focus. This turned out to be related to
the logic for text attribute runs.
GTK MR with a suggested fix: [3]

[1] https://gitlab.gnome.org/GNOME/gtk/-/commit/224e587cd30b9452eb19d3ec06f9f49ccd3c7cd0
[2] https://gitlab.gnome.org/GNOME/gtk/-/commit/e7dfe11e6aa3513a661bfbe5028ad0d792a3fc9e
[3] https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/8208

Change-Id: Icab099eee6d895fe4373ef6356793ca0789e8b72
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/161062
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>
Tested-by: Jenkins

0 files changed, 0 insertions, 0 deletions