There is an updated pull request by 4ricci against master on the void-packages repository

https://github.com/4ricci/void-packages sway
https://github.com/void-linux/void-packages/pull/30576

sway: restore support for gtk-primary-selection
This reverts https://github.com/swaywm/sway/commit/5ad3990a6c9beae44392e1962223623c0a4e3fa9 and fixes clipboard issues with Firefox ESR 78.

See https://github.com/swaywm/sway/issues/6169, https://github.com/swaywm/sway/pull/5788, https://github.com/swaywm/wlroots/issues/2421.

The issue should only affect GTK versions older than 3.24.24, but apparenty Firefox 78 (and maybe others) is affected even if we have a more recent GTK.
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#### General
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- [x] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR

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A patch file from https://github.com/void-linux/void-packages/pull/30576.patch is attached