Dark Room second window DPI does not update when moving between monitors

[fpottbaecker]

Describe the bug

When opening the second window in the darkroom view (e.g. to have the image previewed on a high color accuracy, High DPI monitor while working on a monitor where more Elements fit on the screen at default DPI), the second window DPI seems to always be set to the DPI of the main window at the time the second window was opened.

There is a workaround: Move the main window to the high DPI monitor before opening the second window, but this is a bit cumbersome. So this is not a critical issue, more one of convenience.

Steps to reproduce

1. Work on a system (macOS in my case) with monitors with mixed DPI setups (e.g. HiDPI MacBook Screen + external monitor)
2. Open any image in darkroom on the lower DPI monitor and enabled "display a second darkroom image window"
3. Move the second window to the high DPI display.

Expected behavior

the second window should display the preview in the new Monitors DPI

Logfile | Screenshot | Screencast

Expected second window

Actual second window (lower resolution / DPI). This does not change even if the main window is moved to the high DPI monitor (where the UI updates to the new DPI).

Log -d common, not sure if that is enough
darktable.log

Commit

No response

Where did you obtain darktable from?

downloaded from www.darktable.org

darktable version

darktable 4.8.1

What OS are you using?

Mac

What is the version of your OS?

macOS 14.7.1 (23H222)

Describe your system?

External Monitors at "regular" DPI connected to a MacBook with a high DPI screen.

Are you using OpenCL GPU in darktable?

I dont know

If yes, what is the GPU card and driver?

No response

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

No response