linux client mouse position is wrong if your display isn't at +0+0

[Alex]

Aparently there seems to be a bug in handling/mapping mouse coordinates.

There was an old bug on MICROS~1 #980 similar to this one.

MWE:

1. Have a display setup, where there is no display on +0+0, e.g. XWAYLAND0 connected 1366x768+1920+0
2. xpra attach to a random xpra server session
3. Try to click something in a window

Expected result:

• You can click something

Result:

• You can't
• Focusing a window with your mouse works though

Workaround:

• Change your display setup to start at +0+0, e.g. XWAYLAND0 connected 1366x768+0+0

Tested client on debian bullseye/sid:

• v3.0.8-r25889
• r26081 v4.0-20200410r26081-1
• r26095 v3.0.9-20200412r26095-1

Tested server:

• all above mentioned versions on debian bullseye/sid
• v3.0.8-r25889 on debian buster
• v3.0.6-r25195 on CentOS 7 (7.7)
• v3.0.8-r25889 on CentOS 7 (7.7)

[Alex]

gtk_info.py

[Alex]

xpra log with -d mouse

[Antoine Martin]

Have a display setup, where there is no display on +0+0, e.g. XWAYLAND0 connected 1366x768+1920+0

How do I do that?

[Alex]

Replying to Antoine Martin:

Have a display setup, where there is no display on +0+0, e.g. XWAYLAND0 connected 1366x768+1920+0

How do I do that?

Hmm, good question.

In my case (sway wm on wayland) it's one line in ~/.config/sway/config:

output LVDS-1 pos 1920 0 res 1366x768

I've tried to simulate it on Xorg, but xrandr doesn't let me change screen size without changing output mode. :(