Message successfully thawed, (or at least its frozen count has successfully been reduced by 1).
An attempt was made to thaw an unfrozen message. That is, there have been an unbalanced number of calls to notmuch_message_freeze and notmuch_message_thaw.
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Thaw the current 'message', synchronizing any changes that may have occurred while 'message' was frozen into the notmuch database.
See notmuch_message_freeze for an example of how to use this function to safely provide tag changes.
Multiple calls to freeze/thaw are valid and these calls with "stack". That is there must be as many calls to thaw as to freeze before a message is actually thawed.
Return value: