Bug Fixes
- components: add guards, closes #1792 (e25468c)
- perf: queue end markers, related to #1786 (e9e826e)
- reading pathname of null (0c99176)
- some component updates skipped because of throttling (13f650d)
- timeline: correct time diff between Date.now & performance.now (e459259)
- timeline: reduce glitch when mouse dragging the canvas at the bottom (49da3a5)
- typo in flashing warning (75efbf1)