There is a new pull request by paper42 against master on the void-packages repository

https://github.com/paper42/void-packages asunder-gtk3
https://github.com/void-linux/void-packages/pull/40119

[NOMERGE] asunder: use gtk3 port
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#### Testing the changes
- I tested the changes in this PR: **briefly**

this should not be merged yet, they don't have a release and are discussing renaming the project: https://gitlab.gnome.org/Salamandar/asunder/-/issues/2

cc @Chocimier
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A patch file from https://github.com/void-linux/void-packages/pull/40119.patch is attached