Improve performance of automatic break regeneration #28801
Merged
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Do not regenerate breaks unless meaningful change to object start/end times is detected
Tangentially found when profiling #28792.
For reproduction, import https://osu.ppy.sh/beatmapsets/972#osu/9007, move any object on the playfield, and observe a half-second freeze when ending the drag.
Pool summary timeline break visualisations to reduce allocations
Self-explanatory.
Profiling results (release configuration, profile with tracing)