I've just added screen sharing support to Pidgin, based on ximagesrc: https://bitbucket.org/pidgin/main/pull-requests/330#Lpidgin/gtkrequest.cT1783 It's not wonderfully pretty, but it basically works, under X. I don't like the fact that I ended up using XQueryPointer(), but I don't think gdk_device_get_window_at_position() works for *foreign* windows, does it? More importantly, it's completely hosed for sharing either the full desktop or individual windows which are Wayland clients. And I have no real clue how to fix it. Suggestions please... :)
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