gtk4 a11y: Report default text attributes

Implement handling of default text attributes
by implementing the GtkAccessibleTextInterface
method `get_default_attributes` recently added to
the GTK 4 API in GTK commit [1]

commit fe64c998f82c218e46211984485a7a824a781426
Author: Emmanuele Bassi <ebassi@gnome.org>
Date:   Sun Mar 3 14:23:37 2024 +0000

a11y: Add GtkAccessibleText.get_default_attributes

With this in place, the default font family for a Writer
paragraph is now reported as expected.

With the paragraph selected in Accerciser's treeview of
the LO a11y hierarchy, this can be seen as follows using
Accerciser's IPython console:

In [4]: acc.queryText().getDefaultAttributes()
Out[4]: 'family-name:Liberation Serif'

This API is available from GTK 4.14.0 on, so bump
the version check for the GtkAccessibleText
implementation to that minimum version.

[1] https://gitlab.gnome.org/GNOME/gtk/-/commit/fe64c998f82c218e46211984485a7a824a781426

Change-Id: Id22bee4b7db542ddde241a4d94a7eb916090ba92
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/164860
Tested-by: Michael Weghorn <m.weghorn@posteo.de>
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

0 files changed, 0 insertions, 0 deletions