[Regression] Fullscreen applications shown stretched and do not fit the screen.

[dnord]

How to reproduce:
0. make sure that OpenGL plugin is enabled and workarounds are disabled
1. disable "unredirect fullscreen windows"
2. launch fullscreen application, that uses resolution lower, than physical
Expected:
Fullscreen application allocates whole screen.
Actually happend:
Application stretched and does not fit the screen and totally unusable.

Tested applications: To the Moon, Yume Nikki, The Binding of Isaac, games of Touhou series.
Actually this bug can't be ignored by just always using "unredirect fullscreen windows". With "unredirect fullscreen windows" disabled it seems all fullscreen applications are broken, but even if "unredirect fullscreen windows" is enabled, due to https://bugs.launchpad.net/compiz/+bug/1525165 Yume Nikki and games of Touhou series are not undirected and remain broken, so it is critical for me.

Related commits (breaking changes were introduced by changes in PrivateGLScreen::paintOutputs in /src/screen.cpp)
https://bazaar.launchpad.net/~compiz-linaro-team/compiz/gles2/revision/3226/plugins/opengl/src/screen.cpp
https://bazaar.launchpad.net/~linaro-graphics-wg/compiz-core/linaro-gles2/revision/2895/plugins/opengl/src/screen.cpp

If you revert "Always bind the FBO for drawing" and the first commit, bug disappears.

Compiz version: 0.9.11.3