gtk4 a11y: Implement new GTK API to set text caret/selectionHEADmaster

Implement the new GtkAccessibleTextInterface methods
to set the text caret or text selection which was
added in upstream commit [1]

    commit b747f87516e6feee8803452e002840dc204e6102
    Author: Matthias Clasen <mclasen@redhat.com>
    Date:   Thu Sep 4 21:27:16 2025 +0200

        accessibletext: Add setters

        Add set_caret_position and set_selection, so we can implement
        these parts of the atspi text interface.

        Fixes #7739

        Part-of: <https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/8914>

With gtk git main and an additional related pending GTK 4
merge request to fix a crash [2], this makes setting
selection and cursor positing using the AT-SPI work
as expected.

Sample scenario:

1) start Writer
2) type "test123"
3) start Accerciser
4) select the paragraph's accessible object in Accerciser's
   treeview of the LO a11y tree
5) Use the API via Accerciser's IPython console:

    In [17]: t = acc.queryText()
    In [18]: t.setCaretOffset(4)
    Out[18]: True
    In [19]: t.setSelection(0, 1, 3)
    Out[19]: True
    In [20]: t.getSelection(0)
    Out[20]: (1, 3)

[1] https://gitlab.gnome.org/GNOME/gtk/-/commit/b747f87516e6feee8803452e002840dc204e6102
[2] https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/8950

Change-Id: I31ad6d628c34b5ba3a5b46696448855a86caff72
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/191179
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

0 files changed, 0 insertions, 0 deletions