The corresponding code was added at https://gitlab.gnome.org/GNOME/gnome-control-center/commit/a86cf1eca2734b5ce8b250a7b16db3328945cf42.
The problem is the call to g_settings_delay in setup_input_section (https://gitlab.gnome.org/GNOME/gnome-control-center/blob/master/panels/region/cc-region-panel.c#L1207): the corresponding call to g_settings_apply is never issued when changing the per-window setting.
The corresponding code was added at https:/ /gitlab. gnome.org/ GNOME/gnome- control- center/ commit/ a86cf1eca2734b5 ce8b250a7b16db3 328945cf42.
The problem is the call to g_settings_delay in setup_input_section (https:/ /gitlab. gnome.org/ GNOME/gnome- control- center/ blob/master/ panels/ region/ cc-region- panel.c# L1207): the corresponding call to g_settings_apply is never issued when changing the per-window setting.