Let `QAccessibleTextWidget::attributes`
report whether strikeout is applied to text
via the "text-line-through-type" IAccessible2 text
attribute [1].
Use a value of "single" when strikeout is applied,
and "none" otherwise.
A previous change already implemented bridging that to
the corresponding AT-SPI "strikethrough" attribute.
Update the existing test tst_QAccessibility::textAttributes_data
to take into account that this attribute is reported
as well now.
[1] https://wiki.linuxfoundation.org/accessibility/iaccessible2/textattributes
Fixes: QTBUG-118106
Change-Id: I0416f00b1c11709d9cd0ca0ee38cc6df6caa6dcf
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>
d2bf45c6ed