gnome-terminal does not retain maximised size when external monitor goes into power save

[Mike Crowe]

Description: Ubuntu 20.04 LTS
Release: 20.04

with standard Ubuntu Gnome desktop.

ii gnome-terminal 3.36.2-1ubuntu1~20.04 amd64 GNOME terminal emulator application
ii gnome-terminal-data 3.36.2-1ubuntu1~20.04 all Data files for the GNOME terminal emulator
ii libvte-2.91-0:amd64 0.60.3-0ubuntu1~20.04 amd64 Terminal emulator widget for GTK+ 3.0 - runtime files
ii libvte-2.91-common 0.60.3-0ubuntu1~20.04 amd64 Terminal emulator widget for GTK+ 3.0 - common files

Steps to reproduce:

1. Have laptop with 1920x1080 display, but closed so the display is not being used.

2. Have external 1920x1200 monitor connected via HDMI.

3. Open gnome-terminal and maximise it.

4. Press Windows+L to lock screen.

5. Leave computer locked for long enough for the monitor to go into power save.

6. Unlock.

7. Notice that gnome-terminal window no longer covers the whole screen - a 120 pixel bar of the desktop is visible at the bottom of the screen.

8. Double click on the gnome-terminal title bar in an attempt to maximise the window and discover that the window gets smaller (because it thought it was already maximised.)

9. Double click on the gnome-terminal title bar again and the window is then maximised correctly.

Expected result:

The gnome-terminal window remains maximised covering the whole screen at step 7. (However, if I were to unplug the external monitor and start using the laptop display I would expect the window to remain maximised but resized to cover the smaller display.)

I suspect that this problem can be reproduced with any two differing display sizes.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-terminal 3.36.2-1ubuntu1~20.04
ProcVersionSignature: Ubuntu 5.4.0-39.43-generic 5.4.41
Uname: Linux 5.4.0-39-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Jul 5 15:47:50 2020
InstallationDate: Installed on 2020-04-18 (78 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
SourcePackage: gnome-terminal
UpgradeStatus: No upgrade log present (probably fresh install)

[Mike Crowe (mac)]

This problem seems to be even worse with a 4K monitor set to 200% scaling. When I follow the procedure above with such a monitor, maximised terminal windows appear to end up twice the width and height of the screen. :(