copy/paste of liquify module does not work properly between different resolutions

Describe the bug

The liquify module seems to be storing the position and size of its warps as absolute pixel values rather than the usual float world coordinates. As a result, copying and pasting the liquify module between images with different pixel resolutions results in the wrong position and size in the target image (in extreme cases, the warp could be entirely off the image).

The same problem happens when making the liquify module part of a style and with module presets.

Steps to reproduce

1. Create a point warp in the liquify module. It should be roughly centered and occupy a fair portion of the image (e.g. radius > 1/4 image height/width).
2. copy image settings
3. paste onto an image with a substantially different pixel resolution
4. click the 'edit nodes' button to display yellow overlay for the node, and observe that it is not centered and occupies a differently-size portion of the image compared to the first image

Expected behavior

Warps should be at the same relative position and size when copied, as are all other drawn shapes.

Logfile | Screenshot | Screencast

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Commit

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Where did you obtain darktable from?

self compiled

darktable version

master 4.9.0+1259~g7c8ca81360

What OS are you using?

Linux

What is the version of your OS?

Mageia 9

Describe your system?

No response

Are you using OpenCL GPU in darktable?

None

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

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