canonical/mir

`MinimalWindowManager` should reposition windows to an active output when their output is removed

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#3,895 opened on Apr 15, 2025

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Description

Problem

If a window is on an output that no longer exists, it will remain at a position on that output, even though that is invalid. This applies to all windows except attached (e.g. layer shell, maximized, fullscreen, etc.)

Solution

  1. When an output is removed, the MinimalWindowManager should find all windows on that output
  2. Those windows should be placed in the next active output
  3. Write a MinimalWindowManagerTest for the new functionality

Contributor guide

Research direction
Examine how MinimalWindowManager tracks window output associations and implement logic to reassign windows to the next active output when an output is removed. Write a test for this functionality.
Tech stack
cpp
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C++Gittesting
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75