Scrolling over membership in Gitter historical room jumps calendar around because those events weren't timestamp massaged

[MadLittleMods]

Scrolling over membership in Gitter historical room jumps calendar around because those events weren't timestamp massaged.

.../r/gitter_gitter:gitter.im/date/2015/11/15

In the future, it would be nice to timestamp massage /join membership events (see MSC3998) so we don't have to do this type of ignoring and so the room is more semantic.

Potential solution

Ignore membership events in the IntersectionObserver (because they aren’t timestamp massaged) so you don’t jump around in the calendar

[MadLittleMods]

Solved instead by ignoring events which appear in the future compared to timestamp in the URL

Fixed in #196