04-19-2021, 01:12 PM
Maybe part of this is the bug report: https://gitlab.gnome.org/GNOME/gimp/-/issues/5952 and because it is now long and jumbled a quote from a month ago (at time of writing.)
You could add your issue to that post.
As far as I know the MacOS packager is still working on a fix.
Quote:The issue can be summed up as "Selection-outlines (a.k.a. marching-ants) are not being drawn in GIMP on MacOS 11".
Specifically:
This applies to all selection tools (area, fuzzy, etc) and modes (add, remove).
Toggling "Show selection" does not address this issue
We know a selection is happening because:
if you click on the "quick mask" button it will correctly mask any non-selected regions
copy'n'paste-as-new-image correctly copies the selected region of the source image.
but the actual mechanism/trick used to draw the selection-outline marching-ants for it no longer works on MacOS 11, and it is this mechanism/trick we need to replace.
You could add your issue to that post.
As far as I know the MacOS packager is still working on a fix.