Dear Maintainer,

with orca running, slowdowns have been observed when using the alt + tab
shortcut when QT applications are launched.

after investigation by orca (1), it has been shown that the bug
originated from
marco. the attached patch corrects the problem.

(1): https://gitlab.gnome.org/GNOME/orca/-/issues/430

pr upstr    eam: https://github.com/mate-desktop/marco/pull/773

thanks !