commit 3f2d0c6bbce99fc2880356ff2ebfd323b5bcd8bc
author rune <rune@opera.com> Tue Mar 07 16:09:10 2017
committer Commit bot <commit-bot@chromium.org> Tue Mar 07 16:09:10 2017
tree 88a601eafa9df8086ada9310c0b1bdce057eaaaf
parent 31211cb8a35a8d9f6664a0f1f6d1957576e077e3

Make ::first-line invalidation work when added or removed.

We were only invalidating ::first-line properly when both old and new
ComputedStyle contained ::first-line styles. Now, instead call
setNeedsLayoutAndPrefWidthsRecalc to trigger changes when either old or
new ComputedStyle does not have ::first-line style.

The ::first-line invalidation is moved from Element to LayoutObject,
and unnecessary traversal code removed.

I have not been able to come up with a case where we need to compare
PseudoIdFirstLineInherited style, so diffing that is removed.

R=mstensho@opera.com
BUG=562418,564239,689979

Review-Url: https://codereview.chromium.org/2728383002
Cr-Commit-Position: refs/heads/master@{#455088}