Joffrey JAFFEUX 92bb845db2
FIX: messages selection with shift + click (#21506)
This commit fixes the shift+click multi selection in threads. We were not correctly using the manager of the message and would attempt to find messages in the channel instead of the thread.

The `activeThread` was also not correctly set sometimes.

Also adds tests for message selection in threads.
2023-05-11 17:52:53 +02:00
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