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Sparked by #1358
In the time panel we collapse large gaps in the data so that if you record a few minutes today and a few minutes tomorrow you won't need to scroll and zoom so much. But when is a gap big enough to warrant collapse?
The previous logic could sometimes produce way too many collapsed gaps, sapping performance and usability.
This PR changes the logic completely. The new logic only collapses a gap if it would shrink the whole timeline by at least some significant amount, which right now is hard-coded to 35% (more if there is very few datapoints). It also adds a new upper limit, so that we never collapse more than 20 gaps.
At the end of the day, this is just an improved heuristic, and still not "perfect", whatever that would mean.
Checklist
CHANGELOG.md
(if this is a big enough change to warrant it)