Paths in Retouch module become partly un-editable if outside of the canvas

Is there an existing issue for this?

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

Describe the bug

AFAIK it is not possible to pan or navigate outside of the canvas limits. This makes paths or part of paths drawn outside of the canvas limits inaccesible, specially on high zoom levels.

Steps to reproduce

Create a path in the retouch module partly outside of the canvas area.

Expected behavior

Allow to pan outside of the canvas area

Logfile | Screenshot | Screencast

No response

Commit

No response

Where did you obtain darktable from?

distro packaging

darktable version

5.6.0

What OS are you using?

Linux

What is the version of your OS?

Ubuntu 26.04

Describe your system

No response

Are you using OpenCL GPU in darktable?

Yes

If yes, what is the GPU card and driver?

NVidia RTX 4070

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

No response

Reproduce the problem in the Retouch module by drawing a path partly outside the canvas and zooming in. Start by tracing the module's canvas navigation and input handling; done means paths outside the canvas can be reached and edited by panning beyond the canvas limits.