#73 Artifacts when reparenting root window or notion's stuff with compositing

[Sergey Miroshnichenko]

Alpha channel for color seems didn't get correct value, so you get artifacts when reparent something in "root" window, for example if you do vertical split you get a "copy" of old window without reparenting instead of wallpaper's background. I set background with hsetroot.

Also if I turn off transparent_background in theme file all works well.

As far I know there was some similar bug in awesome. To fix it developers used alpha-channel(32-bit) color for all awesome's "paintings" include "wallpaper"/rootwindow. I hope this info can help.

[Arnout Engelen]

Can you describe the steps for reproducing this problem?

[Sergey Miroshnichenko]

Yes.
1)Now I'm using latest snapshot from git(1339872)
2)Run some composition manager, for example compton or xcompmgr
3)Make split/vsplit or something else and try resize it to reparent root window
4)Now you can get artifacts like here:
http://i.imgur.com/f6rORo9.png

[Arnout Engelen]

I can reproduce the issue with compton. It also occurs when I simply switch to a 'floating' workspace.

Notion doesn't paint the wallpaper/rootwindow. I guess that's sort of the problem :) - but it was sort of the intention to leave that up to external apps like wmsetbg. Some more digging to do I suppose.

[Arnout Engelen]

Asking for help at https://github.com/chjj/compton/issues/225 , too