The proposed changes in src/ are still useful (the merge proposal was never closed): future packages for macOS with GTK3/Quartz will still benefit if Inkscape had better internal relocation support on that platform than what the current code offers. The details of the proposed changes will have to be reviewed/adapted by whoever will work on future macOS packages of Inkscape with GTK3/Quartz.
The proposed changes in src/ are still useful (the merge proposal was never closed): future packages for macOS with GTK3/Quartz will still benefit if Inkscape had better internal relocation support on that platform than what the current code offers. The details of the proposed changes will have to be reviewed/adapted by whoever will work on future macOS packages of Inkscape with GTK3/Quartz.
Proposing to keep this one open for now.