Public bug reported:

*Steps to reproduce:*
I am not sure about the exact conditions for this, and the behavior is not 100% 
consistent.
So I am just going to summarize how this usually happens for me.

Currently this is reported as a bug in mate-terminal, because this is
what I clicked on when I did the bug report with ubuntu-bug -w.

I run a triple monitor setup:
- A: Laptop (Dell XPS 13), full HD.
- B, C: Two full HD external monitors, connected via HDMI, via a USB-C Hub.
Perhaps it is enough to test this on two monitors instead of three.

Currently I have "Undecorate maximized windows" enabled in MATE Tweak, but I 
remember it happened without that before.
(I use that to get rid of the title bar in Brave browser. Doing this in the 
application itself was causing problems)

I have a full-screen application on monitor B.
Currently this is PhpStorm, previously the same happend with Brave browser.

I have another full-screen application on monitor C.
Currently this is Brave browser.

I open a non-maximized window on top, and move it to the edge so that it 
overlaps with multiple monitors (most importantly B and C).
Often this is a terminal, but currently it is the "MATE Tweak" config window / 
dialog.
 should be displayed behind the maximized window on monitor C, but in front of 
the maximized window on B.
I focus the non-maximized window (e.g. terminal).
Then I focus the maximized window on monitor C.

*What I expect to happen*
When I focus the non-maximized window, that window is displayed on top of all 
others.
When I focus the maximized window on monitor C, the non-maximized window (e.g. 
terminal) should be displayed behind the maximized window on monitor C, but in 
front of the maximized window on B.

*What happens instead, v1*
When I focus the non-maximized window, that window is displayed on top of all 
others -> good.
When I focus the maximized window on monitor C, the maximized window on monitor 
B also jumps to the front, so the non-maximized window (e.g. terminal) gets 
hidden behind.

*What happens instead, v2*
When I focus the non-maximized window, it appears in the front on monitor C, 
but it disappears behind the maximized window on monitor B, even if that window 
does not have focus.


*Additional info*
Overall I find the behavior with multiple monitors buggy. The system seems to 
get confused every time I connect or disconnect external monitors. But this is 
a problem for another day.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: mate-terminal 1.20.0-4
ProcVersionSignature: Ubuntu 4.15.0-72.81-generic 4.15.18
Uname: Linux 4.15.0-72-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: MATE
Date: Thu Dec 19 13:02:55 2019
ExecutablePath: /usr/bin/mate-terminal
InstallationDate: Installed on 2019-01-12 (340 days ago)
InstallationMedia: Ubuntu-MATE 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
SourcePackage: mate-terminal
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug bionic third-party-packages

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https://bugs.launchpad.net/bugs/1857008

Title:
  Active window hidden behind other on second monitor

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