Is there a specific reason that Mutter's meta_window_get_client_pid() is
private? As you pointed out in the commit message, the value returned by
meta_window_get_pid() is invalid for Flatpak apps since they're in a
private PID namespace.
I'm experimenting with a scheme to automatically stop and continue
processes from Gnome Shell and it depends on meta_window_get_client_pid()
to get the correct PIDs for Flatpak apps but I obviously only want to rely
upon it if it can be made public.
Do you have any concerns with making the function public?
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