https://bugs.kde.org/show_bug.cgi?id=418250
--- Comment #2 from Robin Randhawa ---
I think I've found a relevant lead: It turns out that simply clicking the OK
button in the keyboard shortcuts dialog after registering a new shortcut is
_not_ enough for the shortcut to become persist
https://bugs.kde.org/show_bug.cgi?id=418250
--- Comment #1 from Robin Randhawa ---
I find that 2 key combinations for 'Delete Message' don't work at all (not even
for the first invocation). Not sure if that has a bearing here. The combination
I tried was 'Ctrl + d'.
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https://bugs.kde.org/show_bug.cgi?id=418250
Bug ID: 418250
Summary: A single letter keyboard shortcut for the 'Delete
Message' action only works once
Product: kmail2
Version: 5.11.3
Platform: Kubuntu Packages