Good find, John, thank you! Confirming exactly as described. This constitutes unexpected and serious dataloss, and imo pretty easy to get into and not exactly an edge case, there might be very good reasons to move messages from a local folder into an IMAP folder. Even if it was an edge case, it may still have catastrophic consequences for large numbers of messages moved. I guess similar desasters may happen when the network just goes away during the move or some such, so it may be even easier to get into. Per [bug fields legend for severity](https://wiki.mozilla.org/BMO/UserGuide/BugFields#bug_severity), dataloss is S1. We should seek to fix this asap. I noticed that the message body is already gone after the move to the IMAP folder when offline. Trying to drag the message back to a local folder shows an alert which might be helpful for understanding this.
Bug 1787963 Comment 1 Edit History
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Good find, John, thank you! Confirming exactly as described. This constitutes unexpected and serious dataloss, and imo pretty easy to get into and not exactly an edge case, there might be very good reasons to move messages from a local folder into an IMAP folder. Even if it was an edge case, it may still have catastrophic consequences for large numbers of messages moved. I guess similar desasters may happen when the network just goes away during the move or some such, so it may be even easier to get into. Per [bug fields legend for severity](https://wiki.mozilla.org/BMO/UserGuide/BugFields#bug_severity), dataloss is S1. We should seek to fix this asap. I noticed that the message body is already gone after the move to the IMAP folder when offline. Trying to drag the message back to a local folder shows an alert which might be helpful for understanding this. v v Note: tracking-firefox* flags are wrongly set by BMO automation, wasn't me. Can't remove them either.
Good find, John, thank you! Confirming exactly as described (102.2.0 (64-bit), Win10). This constitutes unexpected and serious dataloss, and imo pretty easy to get into and not exactly an edge case, there might be very good reasons to move messages from a local folder into an IMAP folder. Even if it was an edge case, it may still have catastrophic consequences for large numbers of messages moved. I guess similar desasters may happen when the network just goes away during the move or some such, so it may be even easier to get into. Per [bug fields legend for severity](https://wiki.mozilla.org/BMO/UserGuide/BugFields#bug_severity), dataloss is S1. We should seek to fix this asap. I noticed that the message body is already gone after the move to the IMAP folder when offline. Trying to drag the message back to a local folder shows an alert which might be helpful for understanding this. v v Note: tracking-firefox* flags are wrongly set by BMO automation, wasn't me. Can't remove them either.