When using HiDPI, in Ghidra, some window content is not scaled up but some are

[pellaeon]

Describe the bug

1. I have 2 screens, one is scaled at 150%, the other at 100%
2. When running Ghidra from xpra, and placing all windows on the 150% screen, one window of Ghidra has the correct frame size, but the content was small (seems to be 1/2 size). One other window has both correct window frame size and content size.

To Reproduce Steps to reproduce the behavior:

1. xpra start ssh://...
2. Download and unpack Ghidra, I tested 11.0.3 and 10.2.2.
3. Run Ghidra by running ./ghidraRun in the unpacked directory.
4. See the screenshot:

System Information (please complete the following information):

• Server OS: Ubuntu 22.04.4 LTS
• Client OS: Ubuntu 24.04 LTS
• Xpra Server Version: 6.1-r35816-1
• Xpra Client Version: Xpra GTK3 Wayland client version 6.1-r35816 (gefa5e2cf65) beta
• KDE Plasma version: 5.27.11
• Display server: Wayland

Additional context

• If I move the windows to the 100% screen, everything becomes normal again.
• I tested konsole running on the xpra server, with its window on the 150% screen, it is displayed as expected. (It's blurry but expected.)
• Regardless of the setting of KDE's Xwayland Client Scale , the behavior of this bug is the same.

[totaam]

Sounds quite similar to #4167 for macos. I believe that MS Windows also has the same problem, see also #3943 which may help there.

[totaam]

Could be related to #3994

[pellaeon]

I can confirm that adding --opengl=force:native solves the problem. Performance-wise I don't feel any difference but the applications that I use generally don't need a high frame rate.

Thank you for your prompt response, I'm happy to help debug this further.

[totaam]

This commit fixes things for v6.1 when running Wayland clients: 641847cf278aef4859497c7f0e55f6d3d67a162e Wayland clients and MacOS / Windows use the --opengl=gtk backend - I will need to test some more before backporting this to older branches.