Public bug reported:
When using GNOME Flashback on Ubuntu, creating an additional panel on
the bottom, left, or right side of the screen causes maximized
application windows or browser to overlap the panel area instead of
respecting reserved workspace space.
The issue occurs consistently and is reproducible on multiple Ubuntu
releases.
Affected Ubuntu Versions:
* Ubuntu 22.04 LTS
* Ubuntu 24.04 LTS
* Ubuntu 26.04 LTS
Affected Sessions:
* GNOME Flashback (Metacity)
* GNOME Flashback (Compiz)
Steps to Reproduce:
1. Install GNOME gone-season-flashback:
2. Log into a GNOME Flashback session.
3. Right-click an existing panel and create a second new panel.
4. Move the new panel to the bottom, left, or right side of the screen.
5. Open any application and maximize the window.
Expected Result:
Maximized windows should stop at the panel edge and respect the reserved
workspace area.
Actual Result:
Maximized windows overlap the newly created panel. The panel does not reserve
screen space correctly.
Additional Notes:
* Issue is consistently reproducible.
* Restarting gnome-panel does not resolve the issue.
* Logging out and back in does not resolve the issue.
* Auto-hide is not a valid workaround.
* Problem occurs with both Metacity and Compiz sessions.
* Appears related to missing or broken _NET_WM_STRUT / EWMH reserved space
handling.
* Existing top panel usually behaves correctly, while newly created panels do
not.
Packages Involved:
* gnome-panel
* gnome-flashback
* metacity
* compiz
Impact:
This breaks normal desktop usability because application windows are rendered
underneath panels, obscuring UI elements and reducing usable workspace.
Regression / Compatibility Concern:
GNOME Flashback panel behavior appears incompatible with modern Ubuntu releases
while legacy GNOME panel functionality previously on 18.04 LTS reserved
workspace space correctly.
** Affects: gnome-flashback (Ubuntu)
Importance: Undecided
Status: New
** Tags: panel
** Attachment added: "Panel overlapping"
https://bugs.launchpad.net/bugs/2152219/+attachment/5969736/+files/Screenshot%20from%202026-05-12%2005-53-36.png
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https://bugs.launchpad.net/bugs/2152219
Title:
GNOME Flashback additional 2nd panel overlaps maximized windows
instead of reserving screen space
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