Disabling monitor causes confusion on Hyprpanel

[MGThePro]

Describe the bug
Disabling a monitor causes anything that's per monitor (OSD showing on the active display, per-monitor workspaces) to always run on the wrong display

To Reproduce

1. Use three monitors
2. In my case: Use split-monitor-workspaces plugin. Not sure if relevant
3. Disable one of the monitors (in my case the rightmost monitor, not sure if relevant)
4. Cause something that'll show the OSD like changing volume via hotkeys, and the OSD will appear on the incorrect monitor
5. When switching workspaces, the workspace indicator in hyprpanel will change on the monitor where the workspace hasn't changed. The Workspace itself changes correctly.
   In other words: I have monitors A, B and C. I disabled monitor C. Now, when I change workspaces on Monitor B, the workspace changes correctly, but the workspace indicator changes on Monitor A

Interestingly, enabling Monitor C again doesn't solve this, nor does restarting Hyprpanel. I havent tested it with the monitor being disabled right away through the config as my setup wouldnt really work that way, but that may indicate that hyprpanel has issues with disabled but connected monitors as a whole.

Expected behavior
Changing the Workspace on Monitor B should change the workspace indicator on Monitor B and keep the mouse there.

Desktop (please complete the following information):

• Distribution: Arch Linux
• Window Manager/Desktop Environment: Hyprland (ags-hyprpanel-git r614.6385f2e-1)
• Addons: split-monitor-workspaces

[MGThePro]

Interestingly, replacing one of the monitors seems to have fixed it....

Not sure if it's luck that it's working now, or bad luck that it wasn't working previously. Not sure if the issue should be closed now as I can't really test any changes to try and fix it

[probavee]

What do you mean by replacing one of the monitor ?
I'm experiencing the same issue. I'm using a basic script to disable the laptop monitor when any other monitor is plugged-in.
I have 2 external monitors enabled HDM1 and HDMI2 and a disabled laptop monitor eDP-1.
All notifications and OSDs (like volume changing) always appears on the wrong monitor. If I have my cursor on HDMI1 monitor, it shows up on HDMI2 and vice versa.

[MGThePro]

What do you mean by replacing one of the monitor ?

I mean quite literally taking one of the monitors and replacing it with a different model monitor.

One thing to note is that previously the two external monitors were the same model, now they're different models. Maybe there is something wrong with how Hyprpanel identifies/differentiates monitors

[probavee]

You were right, that was a really helpful observation, thank you !

I do have two monitors of the same model, and after checking the code, it seems it doesn't use the serial number or any other unique identifier to differentiate between identical monitors.

It looks like PR #998 by @randomthought fixed it for me!
I applied it on the latest master branch, and now notifications appear correctly on the focused monitor, the problem is gone (at least for now).

Hopefully this helps someone else too.