Window fills the entire screen but isn't maximized

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
58/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Tech stack
python
Domain
desktop

Research direction

Reproduce the issue by opening Update Manager on LMDE and checking whether the window fills the screen without being marked maximized. Trace the window startup and sizing behavior to find where its maximized state is set. Done means the window is both full-screen-sized and recognized as maximized, without changing its visible size.

Written by the indexing model from the issue text.

Description

BUG

Describe the bug
The update manager window fills the entire screen, but it isn't maximized. Maximizing it doesn't change anything except for the window actually counting as maximized.

Screenshots
Image

To Reproduce
Steps to reproduce the behavior:

  1. open update manager
  2. observe that it fills the entire screen but isn't maximized

Expected behavior
The update manager is maximized, because it fills the entire screen anyways.

Distribution:

  • Linux Mint
  • LMDE
  • Other (please specify)

Software version:
7.1.4

Logs:

2026.04.28@19:01 ++ Launching Update Manager
2026.04.28@19:01 ++ Initial refresh will happen in 0 day(s), 0 hour(s) and 10 minute(s)
2026.04.28@19:01 ++ Inhibited power management
2026.04.28@19:01 ++ Checking for updates
2026.04.28@19:01 ++ System is up to date
2026.04.28@19:01 ++ Refresh finished
2026.04.28@19:01 ++ Resumed power management

Additional context
I tested this on multiple computers with different screen resolutions. Also this issue is extra noticeable when using the transparent panels extension for Cinnamon, because that makes the panel transparent if there's no window maximized, and that doesn't work with update manager.

Dominant language
Python
Stars
425
Forks
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