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epriestley c666cb9f0b Reduce the frequency of DOM scans to rebuild inlines when scrolling revisions
Summary:
Ref T13513. See PHI1734, which raises a concern about the performance of large revisions near the 100-change threshold.

Currently, `getInlines()` is called whenever the scroll position transitions between two changesets, and it performs a relatively complicated DOM scan to lift inlines out of the document.

This shows up as taking a small but nontrivial amount of time in Firefox profiles and should be safely memoizable.

Test Plan:
  - Under Firefox profiling, scrolled through a large revision.
  - Before change: `getInlines()` appeared as the highest-cost thing we're explicitly doing on profiles.
  - After change: `getInlines()` was no longer meaningfully represented on profiles.
  - Created inlines, edited inlines, etc. Didn't identify any broken behavior.

Maniphest Tasks: T13513

Differential Revision: https://secure.phabricator.com/D21261
2020-05-15 09:37:41 -07:00
..
builtin Dynamically composite favicons from customizable sources 2018-03-12 15:28:41 -07:00
celerity Reduce the frequency of DOM scans to rebuild inlines when scrolling revisions 2020-05-15 09:37:41 -07:00
cows Use PHP implementation of Cowsay for cowsay rule 2015-09-13 12:27:30 -07:00
emoji Add aliases for "party" emoji (🎉) 2018-02-05 12:23:26 -08:00
figlet/custom Include "Figlet" and PEAR "Text_Figlet" in externals 2015-09-13 12:30:48 -07:00
font Made Meme Generator 2013-01-19 18:43:43 -08:00
sprite Uh, update Phabricator login image 2017-08-11 13:37:26 -07:00
sql Add generic "attributes" storage to inline comment tables 2020-05-04 13:09:55 -07:00
sshd Drop interactive login from sshd example 2017-06-27 12:51:46 -07:00
timezones Merge a small amount of remaining "libphutil/" code with Phabricator, break libphutil dependency 2020-02-12 15:17:36 -08:00