[Webkit-unassigned] [Bug 119350] New: Speed up moving cursor/selection up or down past non-renderered elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=119350

           Summary: Speed up moving cursor/selection up or down past
                    non-renderered elements
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: HTML Editing
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: darin at apple.com, koivisto at iki.fi,
                    arpitabahuguna at gmail.com, enrica at apple.com,
                    akling at apple.com


Merge https://chromium.googlesource.com/chromium/blink/+/965746ed22a5e210eb8c33adf300deab9a9c8332

Skips calling firstPositionInOrBeforeNode when a node doesn't have a
renderer, since there couldn't possibly be a visible position there.
This was particularly wasteful when trying to move the cursor up when at
the beginning of a document, as it did a O(n^2) scan through the document head.

See bug for easy repro steps.

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