a11y AT-SPI: Method "ScrollSubstringTo" from AT-SPI text interface not supported

Since commit https://gitlab.gnome.org/GNOME/at-spi2-core/-/commit/11c1a655ab4a9670dfc8ace9b5a9d6b722054980, the AT-SPI text interface has a method called "ScrollSubstringTo" that can be used to scroll the view so that the specified text portion becomes visible on screen.

Doc: https://lazka.github.io/pgi-docs/Atspi-2.0/classes/Text.html#Atspi.Text.scroll_substring_to

However, Qt currently doesn't support it.

Sample steps to reproduce with the Qt 6 based UI variant of LibreOffice:

1) open attached document "lorem2.odt" in the Qt 6 based variant of LibreOffice Writer

2) run the attached pyatspi script "pyatspi-script-scrolltosubstring.py" that calls the "ScrollSubstringTo" method on the paragraph's a11y object to scroll to the end of the paragraph:

$ python3 pyatspi-script-scrolltosubstring.py 

Actual result:

The script prints an error message:

Traceback (most recent call last):
  File "/home/michi/git/computer-doc/TODO/misc/pyatspi-script-scrolltosubstring.py", line 39, in <module>
    text_iface.scrollSubstringTo(text_iface.get_characterCount() - 5, text_iface.get_characterCount(), pyatspi.component.SCROLL_ANYWHERE)
  File "/usr/lib/python3/dist-packages/pyatspi/text.py", line 599, in scrollSubstringTo
    return Atspi.Text.scroll_substring_to(self.obj, startOffset, endOffset, scroll_type)
gi.repository.GLib.GError: atspi_error: No such object path '/org/a11y/atspi/accessible/2147484542' (1)

The LibreOffice view remains unchanged.

Expected result:

The view should be scrolled so that the end of the paragraph becomes visible.