[Impact]

Due to a bug in GTK+2, mate-display-properties crashes when the screen
resolution is changed *outside* of it (e.g. by changing the resolution
not via that app, but somewhere else).

The attached patches fix the issue in GTK+2 and prevent crashing of
m-d-p.

Since this issue caused much inconvenience for users, the fix should be
backported to all current stable releases of Ubuntu.

[Test Case]

The easiest way to reproduce it is via Virtualbox:

1. Run mate-display-properties in the VM.
2. Make the VM go full-screen.
3. See m-d-p crash.

[Regression Potential]

After several months of testing the patched version of GTK+2 in Debian Jessie, 
I found no regressions.
I consider the regression risk very low here.

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Desktop Bugs, which is subscribed to gtk+2.0 in Ubuntu.
https://bugs.launchpad.net/bugs/1351890

Title:
  Changing external screen resolution with dual monitors

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