timeline: strange display when starting the program

[esq4]

Is there an existing issue for this?

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

Describe the bug

In the last few months (I didn't notice from which version) when the darktable is launched, timeline is not displayed or is displayed partially. The timeline view becomes normal only after clicking LMB on it or after scrolling the mouse wheel over it.

Steps to reproduce

1. run darktable
2. see like screenshots 5.1.0+473_linux-1.png, 5.1.0+473_windows10-1.png
3. click LMB on timeline or hover mouse over timeline and scroll the mouse wheel.
4. see like screenshots 5.1.0+473_windows10-2.png, 5.1.0+473_linux-2.png

Expected behavior

normal view as on screenshots 5.1.0+473_windows10-2.png, 5.1.0+473_linux-2.png immediately after starting the darktable

Logfile | Screenshot | Screencast

5.1.0+473_windows10-1.png

5.1.0+473_linux-1.png

5.1.0+473_windows10-2.png

5.1.0+473_linux-2.png

Commit

No response

Where did you obtain darktable from?

darktable.org / GitHub release

darktable version

5.1.0+473~g51e22e438a

What OS are you using?

Linux, Windows

What is the version of your OS?

Windows 10, Debian 12

Describe your system

No response

Are you using OpenCL GPU in darktable?

Yes
I tried to turn opencl on and off

If yes, what is the GPU card and driver?

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

No response

[pehar1]

Can't reproduce, 5.1.0+476~g4295d97a01, Ubuntu 24.04

[esq4]

I did some research and found the reason: сommit c176011. Before it, the timeline view is always normal.

[esq4]

rework splash screen to avoid keep-above: fix timeline #18551
This change helped.
Although it ruined the "Commit c176011" itself.