| commit | 0490413eb83cf3f9eafc459ff49076a1a02f0308 | [log] [tgz] |
|---|---|---|
| author | Wyatt Allen <wyatta@google.com> | Wed Aug 10 11:29:17 2016 -0700 |
| committer | Wyatt Allen <wyatta@google.com> | Wed Aug 10 11:47:27 2016 -0700 |
| tree | 998013e230babdb3a32776ec6ddc14442e21d4d2 | |
| parent | f496436abebb14fab13bee218aa79321e72ccf05 [diff] |
Applies optimizations to GR-DIFF-SELECTION A major source of latency in creating comments in large diffs stems from GR-DIFF-SELECTION applying selection-restricting classes to a parent of the diff. When the diff contains a large number of lines (and thus a large number of elements) applying a class forces a style recompute for the substantial subtree. This change optimizes this in two ways: * **Initialize to the right side:** The selection-restricting class is initialized to the right side, before the diff is even completely built. This eliminates the need for a recomputation preceding the first comment add on the right side (the most-likely side to be interacted with). * **Minimize the number of class modifications:** only add or remove classes when necessary. This eliminates recomputes for consecutive mousedown events that occur on the a common diff side. On an i7 MBP, this eliminates ~120ms for the first comment on the right and ~40ms for subsequent such comments. Change-Id: Ibb8a7eca0398a5c7265dc1385967bce3dae5e5ef
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