Extra window decorations are created on windows with client-side decorations.

[Elliot]

Steps to reproduce after a minimal/full install of Ubuntu MATE:

1. Start up a Gtk3 application with a header bar (tested with Gnome Software) or a browser (such as Firefox) without using a standard window title bar that saves the position and size of the window before it was closed.

2. Maximize the application window, then close it without changing the window size

3. Relaunch the application and resize/unmaximize it

After this, dummy window decorations will be created around the window. This issue has been tested on a Dell XPS 9570 and using Gnome Boxes 3.34.

[Norbert (nrbrtx)]

I can confirm this issue. Many modern GNOME applications are affected. I have seen this behavior with Nautilus, GNOME Calendar and GNOME Software (see attached screencast).

[Bill (franksmcb) (franksmcb)]

Running in VirtualBox with Ubuntu MATE 20.04 20200119 daily.

I can confirm that this behavior exists.

However, following the steps listed to reproduce this I was unable to get this to occur. Performing the steps multiple times. On the 3rd attempt this behavior manifested itself. After this occurred the behavior repeated itself consistently.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Norbert (nrbrtx)]

Happens for me on Ubuntu MATE 18.04 LTS with Chromium from Ubuntu repositories while using Chromium's own window decorations (with *Use system title bar and decorations* unchecked).

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1854383

[Norbert (nrbrtx)]

Still happens on Jammy. Should be fixed before final release.

[Martin Wimpress  (flexiondotorg)]

Does this happen with Yaru MATE on Jammy daily?

[Norbert (nrbrtx)]

Yes, it is. Install gnome-calendar as deb-package and try to resize its window by dragging its window border.

[Martin Wimpress  (flexiondotorg)]

This issue is caused by `mate-maximus` which is part of the `mate-netboot` package. `mate-netboot` doesn't get much upstream development attention so unlikely to fixed in the near future.

Ubuntu MATE provides several resolution-efficient panel layouts, so removing `mate-netbook` from Ubuntu MATE is the best option for addressing this issue.

mate-netbook was removed from ubuntu-mate-meta 1.281:

 - https://launchpad.net/ubuntu/+source/ubuntu-mate-meta/1.281

[Martin Wimpress  (flexiondotorg)]

The workaround for Ubuntu MATE versions prior to 22.04 is to remove the `mate-netbook` package. It is Recommended only, so can be safely removed like so:

killall mate-maximus
sudo apt-get remove mate-netbook

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.