color harmonizer: vectorscope reload switch resets split mode to vectorscope

Is there an existing issue for this?

• I checked and did not find my issue in the already reported ones

Describe the bug

With active split mode (vectorscope and waveform at the same time), clicking the reload button in the Color Harmonizer...

...switches the histogram from the current split mode to single vectorscope mode. It would be nice, if split mode could be kept to avoid manually switching the view back again 😊

Steps to reproduce

see bug description

Expected behavior

see bug description

Logfile | Screenshot | Screencast

No response

Commit

No response

Where did you obtain darktable from?

self compiled

darktable version

5.5.0+752~g5d57b2d099

What OS are you using?

Linux

What is the version of your OS?

Linux Mint 22.3 - Cinnamon

Describe your system

No response

Are you using OpenCL GPU in darktable?

Yes

If yes, what is the GPU card and driver?

Inte Iris Xe i915 / OpenCL 3.0 (neo) 26.09.37435.1

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

No response

Reproduce the issue in darktable's Color Harmonizer by enabling split mode for the vectorscope and waveform, then clicking the reload button. Trace the reload handling and verify that the selected split mode remains active instead of switching to a single vectorscope.