[webkit-reviews] review requested: [Bug 83045] Improve line breaking performance for complex text : [Attachment 141204] Rebased patch.

[bugzilla-daemon at webkit.org]

nholbrook at apple.com has asked  for review:
Bug 83045: Improve line breaking performance for complex text
https://bugs.webkit.org/show_bug.cgi?id=83045

Attachment 141204: Rebased patch.
https://bugs.webkit.org/attachment.cgi?id=141204&action=review

------- Additional Comments from nholbrook at apple.com
Rebased and retested (on Lion). I made one change relative to the previous
patch by not taking the new path when positional effects (tabs) are enabled;
although there were no test failures due to the previous patch, tabs could have
had unwanted side effects.