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window attributes errors

i wanted to try your project and ran into some issues.
i'm testing this on a devuan (chimaera), laptop is an old macbookpro from 2015. the only missing dependencies i had was :

src/cwm.h:15:10: fatal error: GL/glew.h: No such file or directory

so i installed sudo apt install libglew-dev and then compile went fine. i'm testing it through xephyr, nested X session. like so:

 Xephyr -br -ac -reset -no-host-grab -screen 1024x768 :1 &

so everything i want to run is prefixed by DISPLAY=:1.
here's what i got:

[ x-compositing-wm ]
> cc src/main.c -Isrc -I/usr/local/include -L/usr/local/lib -lX11 -lGL -lGLEW -lXcomposite -lXfixes -lXinerama -lm -o x-compositing-wm

[ x-compositing-wm ]
> ls
LICENSE  pics  README.md  src  x-compositing-wm

[ x-compositing-wm ]
> DISPLAY=:1 xterm &
[4] 1297

[ x-compositing-wm ]
> DISPLAY=:1 ./x-compositing-wm 
XError code = 9, string = BadDrawable (invalid Pixmap or Window parameter), resource ID = 0x200009
XError code = 9, string = BadDrawable (invalid Pixmap or Window parameter), resource ID = 0x200009
XError code = 9, string = BadDrawable (invalid Pixmap or Window parameter), resource ID = 0x200009
XError code = 9, string = BadDrawable (invalid Pixmap or Window parameter), resource ID = 0x200009
XError code = 9, string = BadDrawable (invalid Pixmap or Window parameter), resource ID = 0x200009

when i run xterm, i see a dark window appearing, but nothing is visible in it. X pointer seems to notice when i'm hovering terminal or not, the pointer changes from an "X" to a "I" .. if i ctrl-c break x-compositing-wm, suddenly everything becomes visible. but of course x-compositing-wm process is gone. if i try to relaunch it i get:

[ x-compositing-wm ]
> DISPLAY=:1 ./x-compositing-wm 
XError code = 10, string = BadAccess (attempt to access private resource denied), resource ID = 0x51f
XError code = 9, string = BadDrawable (invalid Pixmap or Window parameter), resource ID = 0x200009
XError code = 9, string = BadDrawable (invalid Pixmap or Window parameter), resource ID = 0x200009

seems something is wrong with window attributes. i can run lxqt fine using the same method, through xephyr, and also other WMs too.

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window attributes errors

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