Windows with multiple monitors.
(LP: #1050749) (LP: #1051885)

Written by smspillaz. Simplified by vanvugt.. Fixes: https://bugs.launchpad.net/bugs/1050749, https://bugs.launchpad.net/bugs/1051885. Approved by Sam Spilsbury, Daniel van Vugt.

It was possible for there to be a race condition for a pixmap to become
invalid on the server side if the client which did have control over thier
lifecycle freed them before we were done with them or disconnected. Drivers
have normally handled this condition by reading the contents of the undefined
memory directly without an error, however drivers such as LLVMpipe will
effectively dereference an invalid pointer and crash when you do this.

LP: #927168:
compiz crashed with SIGSEGV in 
memmove() from 
drisw_update_tex_buffer() from 
dri_set_tex_buffer2() from
drisw_bind_tex_image() from 
__glXBindTexImageEXT() from
TfpTexture::enable()

Most of the time we don't need to employ this check. Its only when we know
that we don't control the lifecycle of a pixmap that race conditions
such as these can occur.. Fixes: https://bugs.launchpad.net/bugs/927168. Approved by Daniel van Vugt, jenkins.

https://code.launchpad.net/~vanvugt/compiz/fix-unredirect-flicker/+merge/124632/comments/268309/+download

It was possible for there to be a race condition for a pixmap to become
invalid on the server side if the client which did have control over thier
lifecycle freed them before we were done with them or disconnected. Drivers
have normally handled this condition by reading the contents of the undefined
memory directly without an error, however drivers such as LLVMpipe will
effectively dereference an invalid pointer and crash when you do this.

Eg:

compiz crashed with SIGSEGV in memmove() from drisw_update_tex_buffer() from dri_set_tex_buffer2() from drisw_bind_tex_image() from __glXBindTexImageEXT() from TfpTexture::enable()

Most of the time we don't need to employ this check. Its only when we know
that we don't control the lifecycle of a pixmap that race conditions
such as these can occurr.

[  FAILED  ] CompizOpenGLGLXTextureFromPixmapBindTest.TestTakesServerGrab
[  FAILED  ] CompizOpenGLGLXTextureFromPixmapBindTest.TestNoCallToCheckValidityIfInternalAndImmediateBind
[  FAILED  ] CompizOpenGLGLXTextureFromPixmapBindTest.TestCheckValidityIfExternalNoBindIfInvalid
[  FAILED  ] CompizOpenGLGLXTextureFromPixmapBindTest.TestCheckValidityIfExternalBindIfValid

In the initializing of the plugin, it should not only start handling the events, but also enable GL paint.. Fixes: https://bugs.launchpad.net/bugs/1050752. Approved by Sam Spilsbury.

(LP: #944653). Fixes: https://bugs.launchpad.net/bugs/944653. Approved by Sam Spilsbury, jenkins.

It seems that with USE_GCONF disabled, the gsettings xslt files are not installed. I *think* this might help?. Fixes: . Approved by Brandon Schaefer, jenkins.

It seems that with USE_GCONF disabled, the gsettings xslt files are not installed. I *think* this might help?

This is how it was in compiz 0.9.7, and is required in order to resolve
unity panel shadow bug 1045705.. Fixes: . Approved by jenkins, Sam Spilsbury.

This is how it was in compiz 0.9.7, and is required in order to resolve
unity panel shadow bug 1045705.

(LP: #944653)

This avoids damaging the Unity shell, and hence avoids slowing down everything
when benchmark is visible. (LP: #1039406). Fixes: https://bugs.launchpad.net/bugs/1039406. Approved by Daniel van Vugt.

Mesa bug #54763.. Fixes: https://bugs.launchpad.net/bugs/1037411. Approved by jenkins.

Don't ever enter the subdir of a plugin that is disabled. (LP: #1049100). Fixes: https://bugs.launchpad.net/bugs/1049100. Approved by jenkins, Sam Spilsbury.

Mesa bug #54763.

Migrate profile independent keys separately from the profile dependent keys.. Fixes: https://bugs.launchpad.net/bugs/1046190. Approved by Didier Roche, jenkins.

(LP: #1042552). Fixes: https://bugs.launchpad.net/bugs/1042552. Approved by Daniel van Vugt, jenkins.

(LP: #1048551). Fixes: https://bugs.launchpad.net/bugs/1048551. Approved by Daniel van Vugt, jenkins.

Fixes the some "Use of uninitialised value" warnings reported by valgrind
(LP: #1004336). Fixes: https://bugs.launchpad.net/bugs/1004336. Approved by Daniel van Vugt, jenkins.

The unsigned int nFile can never be smaller than 0 (changed "if (nFile <= 0)" to "if (!nFile)".. Fixes: . Approved by Sam Spilsbury.

Also expose SelectedWindow to public. Fixes: https://bugs.launchpad.net/bugs/1045127. Approved by Daniel van Vugt, jenkins.