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layout: Skip layout traversals that obviously won't do anything. #10021

Merged
merged 6 commits into from Mar 21, 2016
Merged

layout: Skip layout traversals that obviously won't do anything. #10021

merged 6 commits into from Mar 21, 2016

Commits on Mar 21, 2016

  1. layout: Make transform changes require incremental repaint. 

    The progress bar in browser.html was only accidentally working before,
so actually making use of `REPAINT` makes it stop working without this
change.
    @pcwalton
    pcwalton committed Mar 21, 2016
    21ea8ee

  2. layout: Repaint when `z-index` is modified.

    @pcwalton
    pcwalton committed Mar 21, 2016
    5dca005

  3. layout: Don't rebuild display lists at all unless restyling tells us 

    some object needs to be repainted.

Reduces CPU usage when mousing over simple documents. (More complex
documents tend to trigger unnecessary reflow bugs and so still have high
CPU.)

Part of #9999.
    @pcwalton
    pcwalton committed Mar 21, 2016
    acfd8e4

  4. layout: Don't start the reflow pass unless some node needs to be 

    reflowed.

Reduces CPU usage when mousing over simple pages.

Part of #9999.
    @pcwalton
    pcwalton committed Mar 21, 2016
    7cb9429

  5. script: Don't paint layouts induced by hit test queries. 

    Reduces CPU usage when mousing over simple pages.

Part of #9999.
    @pcwalton
    pcwalton committed Mar 21, 2016
    ed6ee29

  6. layout: Minor whitespace cleanup.

    @pcwalton
    pcwalton committed Mar 21, 2016
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