We also discussed emails that can't be decrypted. They are due to implementation details just currently skipped. They will also be so in the future as an implementation detail.

(removed: wrong statement)

Note: I also activated Sign/Encrypt by default, if that matters

I implemented that in the old 2.2 branch for easier testing.

Please let us not clutter the code with OS specific things. We could use a gnupg_remove_ext or gnupg_remove_maybe_wait with a wait parameter which maps to a plain gnupg_remove for Unix. The GPGRT_PROCESS_DETACHED, in the asshelp is also the only specific thing which can be move to a file global macro.

I think that modifying gnupg_remove is a bit risky because it's used in many places.
I'd rather introduce new function for Windows; gnupg_w32_delete_file for this particular purpose.
Factoring out wait_when_sharing_violation function from gnupg_rename_file.

(writing this much later, since got lost)

I had a look at Qt 5. All of Qt's Windows styles are broken with regards to button or menu item styling. They change the background color of the hovered and/or selected button, but they use the default foreground color of the common base style class for the text. I don't think that fixing the (obsolete) Windows styles is worth the effort. As workaround we should use the Fusion style if high-contrast is active.

As this was finished more than a year ago, this should be included (and testable) in vsd

It was decided that we don't want to improve this in KConfig.

Tested a little late and on Windows 11 with VS-Desktop-3.3.90.16-Beta (a Beta for VSD 3.3.3):

The gnupg_remove should retry if it has a sharing violation. Similar to what we do in gnupg_rename_file. I just figured that we do a remove in the latter function too w/o handling a sharing violation.

Here is a possible fix:

Fixed and backported for VSD 3.4 and VSD 3.3.