[Users] Freeze while fetching (showing?) message

[Johan Vromans]

Claws 3.17.6 on Fedora 31.

I have a local MH mailbox.

If the attached message is in this mailbox, claws freezes when I visit
the mailbox.

The 'Folder' display shows the folder and mailbox. 
When I click on the mailbox, the summary is shown but claws freezes
(spinning wheel). The message display is empty. A kill -9 (kill -15 is not
sufficient) is needed.

I have no clue...

-- Johan


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