can't speak on a MUC after disconnecting/redisconnecting from it
How to reproduce :
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join a MUC
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activate « Minimize when closing »
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close it
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in the roster : right click, disconnect (only the MUC, not the whole account)
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Rejoin the same MUC (with the Action menu)
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Messages cannot be sent anymore in it. (but we still receive the messages)
Always reproducible