Adding feature to register pixmap atoms for other compositors

[skarbat]

@Ealdwulf this changeset fixes the desktop obfuscated areas when running the x compositor.

It's not completely working. From time to time there are still areas which do not redraw correctly.
Also eventually xcompmgr starts complaining about invalid windows at load time, which can be repaired by calling kdesk -w, which is a simple broadcast to tell all top level windows to redraw themselves.

[alex5imon]

great stuff @skarbat

[Ealdwulf]

Apart from query above looks good 👍

[skarbat]

Thanks @Ealdwulf . I would like to hold this PR for a new round of testing. I have seen the taskbar also suffering from the repainting issue which might need more system wide detail as you say.

[Ealdwulf]

Okay @skarbat.

On 22 February 2016 at 18:00, Albert Casals notifications@github.com
wrote:

Thanks @Ealdwulf https://github.com/Ealdwulf . I would like to hold
this PR for a new round of testing. I have seen the taskbar also suffering
from the repainting issue which might need more system wide detail as you
say.

—
Reply to this email directly or view it on GitHub
#112 (comment).

[Ealdwulf]

Closing to reopen on master