Public bug reported:

MATE Terminal windows shrink themselves every time they lose or gain focus, 
when CSD is enabled.
This screen recording demonstrates the problem: https://imgur.com/a/kLZYUgh

GTK_CSD=1 in the environment. Running MATE Terminal by any means (the
screen recording uses Alt+F2) initially appears to work fine, but
whenever focus is switched to another window (with either the mouse or
Alt+Tab) the MATE Terminal window shrinks slightly. Then slightly more
when it regains focus.

The video shows GNOME Terminal being run as the other window; it retains
its size. But the other application can be anything at all.

This doesn't happen with GTK_CSD=0; MATE Terminal windows then leave
their size alone.

The shrinking behaviour started happening since I upgraded to Ubuntu
20.04 LTS, from 18.04 LTS. The mate-terminal package is version
1.24.0-2ubuntu1.

To demonstrate the problem and eliminate config in my account being the
problem, I created a new account to check the bug exists there (it does)
and record the video. The computer has the gtk3-nocsd package installed,
but in /etc/X11/Xsession.d/01gtk3-nocsd there is the line:

  export GTK_CSD=1

** Affects: mate-terminal (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1878457

Title:
  Window shrinks on switching focus

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