Hi, someone asked tonight why he couldn't use his dwm keybindings when using is SDL2 application in fullscreen. After investigation it seems that SDL uses _NET_SUPPORTING_WM_CHECK to check if the window manager can handle fullscreen.
Here is a patch implementing it, I'm not sure if I cleared the X properties in the right place though.
0001-added-support-for-_NET_SUPPORTING_WM_CHECK.patch
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