https://bugs.winehq.org/show_bug.cgi?id=46581
--- Comment #14 from Zebediah Figura z.figura12@gmail.com --- (In reply to Matthew Reed from comment #13)
Is this something the developer of Heidi needs to address, or is it an internal Wine issue?
Eh. The program is depending on undocumented behaviour, which is not great, so the best is probably for the application developer to fix it. But it is a bug in Wine, and can be fixed here, and I've submitted patches for it.