synapse-product/changelog.d/9425.bugfix
Andrew Morgan 3e5749b99f
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:

9e19c6aab4/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 17:31:37 +00:00

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