Moved a gpgex/Kleopatra feature request from
https://wald.intevation.org/tracker/index.php?func=detail&aid=1679&group_id=11&atid=129:

I request inclusion of a "secure delete" option. Often I open a GPG protected
file to read (not edit or change) operation. This leaves the .gpg file and the
clear-text file on my hard drive. After I finish the read operation I need to
securely delete the clear text file.

Today I have to rename it to something (such as "delete.me"), then I gpg encrypt
it to any of my own keys and select the "delete source file option", the I
delete in the file browser (explorer). Come to think of it, I really don't know
what the deletion of the source file is in any way a secure operation or if it's
leaving the clear text file sitting around my drive for some snoop to find in
the future.

It would be marvelous if there was a "shred" option presented when I right-click
on a file so that I could perform this operation more rapidly.