Bugzilla

Your attached patch is an improvement (thanks!), but doesn't fix the issues completely yet.

It fixes the message counts during the "get messages" step,
before and after, the counts are the same, and the total equals the selected count.

It fixes disappearing messages during "get message", I don't "visibly" lose messages during this step.
Immediately after the "get message" step, the message list still shows the correct number of messages.

However, despite that display, the mailbox is already in a broken state.

Simply switching to another folder, then going back to this inbox, several messages are gone already.
Still gone after TB restart.

In my scenario, 7 total, 3 messages are gone, 4 messages shown.
After repair folder I have 14 - every original message duplicated (once downloaded, once not downloaded).

The message duplication can be prevented by executing "compact" prior to "repair".

~~Your attached patch is an improvement (thanks!), but doesn't fix the issues completely yet.~~

~~It fixes the message counts during the "get messages" step,
before and after, the counts are the same, and the total equals the selected count.~~

~~It fixes disappearing messages during "get message", I don't "visibly" lose messages during this step.
Immediately after the "get message" step, the message list still shows the correct number of messages.~~

~~However, despite that display, the mailbox is already in a broken state.~~

~~Simply switching to another folder, then going back to this inbox, several messages are gone already.
Still gone after TB restart.~~

~~In my scenario, 7 total, 3 messages are gone, 4 messages shown.
After repair folder I have 14 - every original message duplicated (once downloaded, once not downloaded).~~

~~The message duplication can be prevented by executing "compact" prior to "repair".~~