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Old 11-04-2019, 06:01 AM   #1
azslow3
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Join Date: Nov 2017
Location: Heidelberg, Germany
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Default GDK Warning: gdk_window_set_user_time called on non-toplevel [solved]

Just for information, in case someone notice the same.

That warning was bugging me for a while, in attempt to build Linux iPlug2. After digging deeper, it happens that is a bug in (probably older) Gdk. And it appears every time REAPER FX window with foreign plug-ins is closed.

SWELL can create "foreign" GDK X11 window, and since I get exactly the same warning without REAPER, I guess FX window is using that feature.

The problem is that "foreign" window is not top, but for some reason WM_DELETE_WINDOW is delivered for it. I guess Gdk just set the same properties as for top windows (I have not checked that yet, but event is not delivered to self created X window), so WM delivers that event. Gdk is confused receiving it and print the warning.

In newer GDK that section is rewritten.

Edit: Gdk does that on purpose... in gdk_x11_window_destroy_foreign it sends WM_DELETE_WINDOW explicitly, after reparent to root window. I guess they reparent incorrectly, so it is still not "top window" from Gdk perspective.

Edit: it seems like SWELL way for foreign windows has some logical problems (I have found only very old conversation about this topic, but it seems like Gdk code is still the same). I am going to dig deeper.

Edit: no, SWELL problem... Will describe in the Bug Reports

Edit: fixed in SWELL and so in the next REAPER release.

Last edited by azslow3; 11-13-2019 at 01:59 PM.
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