The remaining issue "Wrong language in GnuPG error messages" is now also fixed. Until there's a new version of libgpg-error I've added the changes as patches.
Today
The root cause is that opening the details reloads the certificate. This triggers a change of the key cache. And that triggers are reload of the group.
Backported for VSD 3.4
This also happens in vsd 3.3.2 and gpg4win-5.0.0-beta413 @ win11
Yesterday
I meant more like if it's worth a ticket at all, as it's an edge case and not necessarily a problem. Ebo and me already agreed, that we can live with it - but if you think it's worth it, I'll create another ticket.
This is now implemented for Gpg4win 5.
Sun, Nov 30
Fri, Nov 28
They can be expanded/collapsed with +/-
I would say this is done.
Tested on gpg4win-5.0.0-beta413 @ win11.
Issues found on gpg4win-5.0.0-beta413 @ win11:
This seems not to work in Kleopatra/gpg in gpg4win-5.0.0-beta413 @ win11.
When an uncertified cert is uploaded, the main button of the warning message also says Export Certificate. Should this be another ticket?
Looks good to me on gpg4win-5.0.0-beta413 @ win11:
Scute fixed in rSc3dc9c581631: w32: Use CSIDL_COMMON_APPDATA if available.
Thu, Nov 27
Additionally to the issue Andre cited years ago, we also did some changes to fix other how signed/encrypted mails are shown, which are also relevant for the inbox. This should be fixed.
Tested on gpg4win-5.0.0-beta413 @ win11 with the following entries in dirmngr.conf:

