Closed Bug 1504064 Opened 6 years ago Closed 6 years ago

[wpt-sync] Sync PR 13843 - [LayoutNG] Use cached fragment if size won't change.

Categories

(Core :: CSS Parsing and Computation, enhancement, P4)

Product:
Core
Component:
CSS Parsing and Computation
Type:
enhancement

Tracking

()

Status:
RESOLVED FIXED
Milestone:
mozilla65
Tracking Flags:
Tracking Status
firefox65 --- fixed

People

(Reporter: mozilla.org, Unassigned)

References

(
URL
)

Details

(Whiteboard: [wptsync downstream]) 

Sync web-platform-tests PR 13843 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/13843
Details from upstream follow.

Morten Stenshorne <mstensho@chromium.org> wrote:
>  [LayoutNG] Use cached fragment if size won't change.
>  
>  Available size may change from one layout pass to another, but that
>  doesn't have to mean that we need to re-lay out a child. If we can be
>  sure that its size will remain the same, and that if it will keep the
>  same size, that won't affect any descendants, we can skip layout and
>  return the cached fragment.
>  
>  We cannot ignore initial containing block size changes if there are
>  orthogonal flow root children, so keep track of that.
>  
>  Makes perf_tests/layout/many-block-children-fixed-inline-size.html
>  about 3 times faster.
>  
>  Update expectations for one invalidation test. The test has some
>  fixed-width descendants, so when only the window width changes,
>  there's less work to do, than before.
>  
>  Update one unit test, and expand it a bit, to provide a case where we
>  actually still do need layout.
>  
>  Bug: 897450
>  Change-Id: I063f650110d5a488de430b938b3d46e713a1433e
>  
>  Reviewed-on: https://chromium-review.googlesource.com/1297367
>  WPT-Export-Revision: 0096b5dd7085f5375e4a042155c772359236df08
Component: web-platform-tests → CSS Parsing and Computation
Product: Testing → Core
Ran 8 tests and 8 subtests
OK     : 8
PASS   : 8
Pushed by wptsync@mozilla.com:
https://hg.mozilla.org/integration/mozilla-inbound/rev/1b54a404506c
[wpt PR 13843] - [LayoutNG] Use cached fragment if size won't change., a=testonly
https://hg.mozilla.org/mozilla-central/rev/1b54a404506c
Status: NEW → RESOLVED
Closed: 6 years ago
status-firefox65: --- → fixed
Resolution: --- → FIXED
Target Milestone: --- → mozilla65
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