Debugview shows:

[8412] org.kde.pim.kleopatra: Collection Progress:  48  total:  1000
[8412] org.kde.pim.kleopatra: 
[8412] org.kde.pim.kleopatra: 0x9cfca58 slotWizardCanceled
[8412] org.kde.pim.kleopatra: Kleo::Crypto::SignEncryptFilesController(0x64c97a8) cancel
[8412] org.kde.pim.kleopatra: Kleo::Crypto::SignEncryptTask(0xeee73c0) cancel
[8412] org.kde.pim.kleopatra: Error:  "Abbruch durch Benutzer"
[8412] org.kde.pim.kleopatra:

It is present in gpg4win 4.2.0. I do not have a later testversion.

In T5903#157763, @ikloecker wrote:

Please add a separate task for an automatic refresh.

we could include the "better explanation" part, though. The options in "GnuPG system (technical)" do not have a tooltip, we could add one there, at least.

The Task from the description is solved in gpg4win 4.2.0. See follow up tickets for anything else.

On Linux it works in principle, you can generate a key.
I could not test this in windows with my setup, but as the external testers did not complain about this use case, I'd say this is resolved. For the rest see ticket T5901.

I want to add that the scrolling/moving windows around (on Linux) is made more annoying than it could be because windows do not adapt in size if hardly any content is shown. Therefore you might have to scroll quite a lot through an empty window before finding the OK button in the lower right corner.

The external a11y testers (working on windows) wrote:

In the group dialog I can not cycle forward with Tab endlessly through the not-greyed-out buttons of the window because the focus gets stuck in the bottom row. There "Revert" is included in the cycling, which is not correct, since it is greyed out. With Shift+Tab, cycling backwards works as expected.

On windows the main window looks ok with high contrast mode black. But with dark backgrounds some items in other windows are not readable:

This works on Linux with KMail and with Claws (although with Claws the attachment is added twice).

works on windows, too

I didn't check with a CardOS / PKCS#15 card but as the solution is not card specific, checking with another card should be sufficent.

It's a shell issue. With bash Kleopatra starts from the shell. Andre will debug further.

As described, the storage location is now shown per subkey in the subkey details window.

works

works as described.

How about giving a notification in Kleopatra relaying gpgs message(s) "signature already revoked"? Instead of ~"3 certifications were successfully revoked, do you want to publish them?"

works. Certificates are shown in alphabetical order to the user and expired subkeys are ignored for encryption even if they are newer.

works as described. But If you already have revoked one or all certifications of that key, you still get the revocation dialog.

works

This works, there is only one gpgsm process at a time while importing a dozen S/MIME certificates at once.

yes, one down, two to go...

signing works, too

follow up of T6517

works (I did only check the first 2 criteria)