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Fix only handling the last presence state for each user (#9425) This is a small bug that I noticed while working on #8956. We have a for-loop which attempts to strip all presence changes for each user except for the final one, as we don't really care about older presence: https://github.com/matrix-org/synapse/blob/9e19c6aab4b5a99039f2ddc7d3120dd3b26c274b/synapse/handlers/presence.py#L368-L371 `new_states_dict` stores this stripped copy of latest presence state for each user, before it is... put into a new variable `new_state`, which is just overridden by the subsequent for loop. I believe this was instead meant to override `new_states`. Without doing so, it effectively meant: 1. The for loop had no effect. 2. We were still processing old presence state for users.

2021-02-17 10:31:37 -07:00

Fix a long-standing bug in the deduplication of old presence, resulting in no deduplication.