Greeter displays on all monitors regardless of outputs.ron configuration (dual monitor setup)

[deanhattenhauer]

Describe the bug: On a dual monitor setup, cosmic-greeter renders the login screen on both displays with no apparent way to restrict it to a single monitor. Editing the greeter's outputs.ron file has no effect on which displays the greeter renders to.

To Reproduce:

1. Boot system with two monitors connected
2. Observe login screen appears on both displays

Expected behavior: The greeter should respect monitor configuration and allow the user to control which display(s) it renders on.

What I tried:

• Edited /var/lib/cosmic-greeter/.local/state/cosmic-comp/outputs.ron and set enabled: r#false for the secondary monitor — greeter still rendered on both displays
• Set xwayland_primary: false on secondary monitor in greeter's outputs.ron — no effect
• Copied working session outputs.ron from ~/.local/state/cosmic-comp/outputs.ron to the greeter's config directory with correct ownership, no effect

System Info:

• OS: Pop!_OS (COSMIC desktop)

• Two monitors:

  • AOC Q27G41ZDF (2560x1440 @ 60hz) via DP-3 (primary/desired login display)
  • Samsung Odyssey G40B (1920x1080 @ 240hz) via DP-1 (secondary)

Additional context: Related to #257, same root issue (greeter renders on all outputs with no way to control it) but reproduced here within a full Pop!_OS + CosmicDM environment rather than standalone cosmic-greeter.

[jerezereh]

Just installed Pop!_OS yesterday and ran into the same issue. Never worked with rust before but went through and wrote up a fix for this. Dunno if I should make a PR yet, but made the commit here. Would appreciate guidance on the patch before opening a PR.