Easy to replicate when you know how: 1. run a profile with an IMAP account 2. disable the connection to the server (Don't use the in-app "go-offline" button, as that'll prevent "compact" appearing in the folder context menu!) 3. delete a message in a folder 4. right click on the folder and pick "Compact" Wait 15 seconds for it to finish retrying. Boom. Same happens for autocompaction, but it's harder to trigger on demand obviously.
Bug 1960105 Comment 21 Edit History
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Easy to replicate when you know how: 1. run a profile with an IMAP account 2. disable the connection to the server (Don't use the in-app "go-offline" button, as that'll prevent "compact" appearing in the folder context menu! Either turn off networking, or kill the server, if you control it) 3. delete a message in a folder 4. right click on the folder and pick "Compact" Wait 15 seconds for it to finish retrying. Boom. Same happens for autocompaction, but it's harder to trigger on demand obviously.