The direct chat account data
content is a map from matrixId
to roomId(s). If we want to find
the roomId for a given userId,
then this is not a problem. But
the other way around, if we
want to check if a given roomId
is a direct chat or not, needs to
process all entries which can be
hundreds. Doing this very
often in an app costs a lot of
performance. This adds a simple
cache in the room object and
validates the cache every time
to make this more efficient.
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