XWayland input broken on vertically stacked monitor with fractional scaling and force_zero_scaling = true

[elliotnash]

Description

When using a dual-monitor setup arranged vertically with fractional scaling enabled (e.g., 1.25), mouse input fails to register on Xwayland applications on the bottom monitor. This issue only occurs when xwayland { force_zero_scaling = true } is enabled in the Hyprland configuration.

This seems similar to #5, however my monitors are not overlapping.

Environment

monitor = eDP-1, 2880x1800@120, 0x0, 1.25
monitor = eDP-2, 2880x1800@120, auto-down, 1.25

xwayland {
  force_zero_scaling = true
}

Hyprland version: Hyprland 0.48.1 built from branch at commit 29e2e59fdbab8ed2cc23a20e3c6043d5decb5cdc (version: bump to v0.48.1).
Xwayland version: The X.Org Foundation Xwayland Version 24.1.6 (12401006) X Protocol Version 11, Revision 0

Workarounds

On my 2880x1800 monitors, placing the bottom monitor 314 or more pixels below the top one (at position 0x2114 allows input to go through in xwayland apps. I'm not sure the significance of 314/2114 pixels, but it seems like the monitors internally overlap when less than this (even though there's a gap between my monitors and I can't move my mouse between them)

[esibun]

+1. I think this is a regression of #2916. I think the underlying XWayland window is being rendered off-screen (not centered) in my case which is causing the mouse values reported to the window to be incorrectly clamped:

MotionNotify event, serial 31, synthetic NO, window 0x3600001,
    root 0x370, subw 0x0, time 154867011, (470,463), root:(5759,1079),
    state 0x0, is_hint 0, same_screen YES

MotionNotify event, serial 31, synthetic NO, window 0x3600001,
    root 0x370, subw 0x0, time 154867013, (470,463), root:(5759,1079),
    state 0x0, is_hint 0, same_screen YES

MotionNotify event, serial 31, synthetic NO, window 0x3600001,
    root 0x370, subw 0x0, time 154867019, (470,463), root:(5759,1079),
    state 0x0, is_hint 0, same_screen YES

MotionNotify event, serial 31, synthetic NO, window 0x3600001,
    root 0x370, subw 0x0, time 154867023, (470,463), root:(5759,1079),
    state 0x0, is_hint 0, same_screen YES

MotionNotify event, serial 31, synthetic NO, window 0x3600001,
    root 0x370, subw 0x0, time 154867027, (470,463), root:(5759,1079),
    state 0x0, is_hint 0, same_screen YES

MotionNotify event, serial 31, synthetic NO, window 0x3600001,
    root 0x370, subw 0x0, time 154867032, (470,463), root:(5759,1079),
    state 0x0, is_hint 0, same_screen YES

MotionNotify event, serial 31, synthetic NO, window 0x3600001,
    root 0x370, subw 0x0, time 154867041, (470,463), root:(5759,1079),
    state 0x0, is_hint 0, same_screen YES

MotionNotify event, serial 31, synthetic NO, window 0x3600001,
    root 0x370, subw 0x0, time 154867044, (470,463), root:(5759,1079),
    state 0x0, is_hint 0, same_screen YES

Possibly related, putting the window into floating mode is also violating the force_zero_scaling option (the window is expanded beyond the borders of the screen, scaled to the highest fractional scaling value regardless of the value of force_zero_scaling).

[vinthara]

Can confirm I have the issue with float mode.

For what it's worth I use horizontal monitors

monitor=HDMI-A-1, 3840x2160@60.0, 0x0, 1.6
monitor=DP-1, 2560x1440@144.0, 2400x0, 1.066667

However I canno't reproduce the bug at leisure, do you have an issue everytime you start your xwayland apps @elliotnash ?

[vinthara]

Been trying to reproduce the bug :

Steps :

1. Have two monitors
2. Turn off 2nd monitor (so that hyprctl monitors all only shows 1 connected)
3. Turn it back on

Now the lower bottom is not clickable for some apps, in my case : the app in question is Eternal Lands a game

monitor=HDMI-A-1, 3840x2160@60.0, 0x0, 1.6
monitor=DP-1, 2560x1440@144.0, 2400x0, 1.066667

xwayland {
  force_zero_scaling = true
}

Info :

󰣇 ~ ❯ hyprctl monitors all                                                                                                                gcloud gcloud   18:28 
Monitor HDMI-A-1 (ID 1):
	3840x2160@60.00000 at 0x0
	description: LG Electronics LG ULTRAFINE 411NTRL6E454
	make: LG Electronics
	model: LG ULTRAFINE
	serial: 411NTRL6E454
	active workspace: 4 (4)
	special workspace: 0 ()
	reserved: 0 38 0 0
	scale: 1.60
	transform: 0
	focused: yes
	dpmsStatus: 1
	vrr: false
	solitary: 0
	activelyTearing: false
	directScanoutTo: 0
	disabled: false
	currentFormat: XRGB8888
	mirrorOf: none
	availableModes: 3840x2160@60.00Hz 3840x2160@60.00Hz 3840x2160@59.94Hz 3840x2160@50.00Hz 3840x2160@30.00Hz 3840x2160@30.00Hz 3840x2160@29.97Hz 3840x2160@25.00Hz 3840x2160@24.00Hz 3840x2160@23.98Hz 2560x1440@59.95Hz 1920x1200@60.00Hz 1920x1080@60.00Hz 1920x1080@59.94Hz 1920x1080@59.93Hz 1920x1080@50.00Hz 1920x1080@30.00Hz 1920x1080@29.97Hz 1920x1080@24.00Hz 1920x1080@23.98Hz 1600x1200@60.00Hz 1680x1050@60.00Hz 1280x1024@60.00Hz 1440x900@60.00Hz 1280x800@60.00Hz 1280x720@60.00Hz 1280x720@59.94Hz 1024x768@60.00Hz 800x600@60.32Hz 720x576@50.00Hz 720x480@60.00Hz 720x480@59.94Hz 640x480@60.00Hz 640x480@59.94Hz 640x480@59.94Hz 

Monitor DP-1 (ID 0):
	2560x1440@144.00000 at 2400x0
	description: Samsung Electric Company Odyssey G61SD HNAXC00265
	make: Samsung Electric Company
	model: Odyssey G61SD
	serial: HNAXC00265
	active workspace: 5 (5)
	special workspace: 0 ()
	reserved: 0 38 0 0
	scale: 1.07
	transform: 0
	focused: no
	dpmsStatus: 1
	vrr: false
	solitary: 0
	activelyTearing: false
	directScanoutTo: 0
	disabled: false
	currentFormat: XRGB8888
	mirrorOf: none
	availableModes: 2560x1440@120.00Hz 2560x1440@239.76Hz 2560x1440@60.00Hz 1920x1200@120.00Hz 1920x1080@239.93Hz 1920x1080@120.00Hz 1920x1080@119.88Hz 1920x1080@60.00Hz 1920x1080@59.94Hz 1600x1200@120.00Hz 1680x1050@59.95Hz 1600x900@60.00Hz 1280x1024@60.02Hz 1440x900@59.89Hz 1280x800@59.81Hz 1280x720@60.00Hz 1280x720@60.00Hz 1280x720@59.94Hz 1024x768@60.00Hz 800x600@60.32Hz 720x480@60.00Hz 720x480@59.94Hz 640x480@60.00Hz 640x480@59.94Hz