Wrong window size on Multi-screen setup

[JaoPedroDev]

Short Summary

I have a weird problem with multi-screen setup, I have two screens, one 720p another 1080p, the problem is that Kando window only gets the size of the 720p screen, disabling this monitor the problem goes away.

Steps to Reproduce the Issue

1. Install kando on Arch
2. Run it
3. Open any menu or Settings screen

Kando Version

v1.7.0

Installation Method

Via a package manger

Desktop Environment

KDE on Wayland

Environment Version

KDE Plasma 6.2.5 on CachyOS(Arch)

Additional Information

No response

[JaoPedroDev]

Okay, upon further fiddling I discovered something interesting, having the two screen aligned by the bottom cause the issue, but aligning them by the top makes Kando the size properly.

This way causes the problem.

This way does not.

So maybe the problem is related with screen coordinates?

[Schneegans]

Hi there! Could you try what I wrote in #347 (comment) and report any findings here?

[JaoPedroDev]

I didn't find any negative numbers or something wrong with the window position values, but the height of the screen did change when I change the second screen alignment.

Position where Kando works fine.

This position reported this:

Window position:  [ 1685, 314 ]  Window's Screen:  { x: 1360, y: 32, width: 1920, height: 1048 }

Position where Kando gets wrong size.

This position reported this:

Window position:  [ 1682, 314 ]  Window's Screen:  { x: 1360, y: 339, width: 1920, height: 741 }

Tested with Electron version 31.7.7

[Schneegans]

Interesting, then it looks like an Electron bug. Could you try this with the latest Electron version? Also, I would assume that it does not happen on X11?

[JaoPedroDev]

Latest version of Electron has the same bug.

On X11 it's working properly.
Both alignments of the second screen gives the same output on Electron Fiddle:

Window position:  [ 1576, 456 ]  Window's Screen:  { x: 1360, y: 0, width: 1920, height: 1080 }

[Schneegans]

Someone mentioned on Discord that some issues may get resolved when using the native Wayland backend of Electron. Could you try executing Kando with --enable-features=UseOzonePlatform --ozone-platform=wayland?

On GNOME, it doesn't start with this, but at least on Hyprland, it seems to work.

[Schneegans]

@JaoPedroDev, could you test what I have written above? On Hyprland, this seems to fix all screen-position related issues...

[Schneegans]

Alternatively, setting ELECTRON_OZONE_PLATFORM_HINT=wayland before running Kando could work.

[Schneegans]

I'll close this for now. Feel free to report here if the issue persists.