Writing-mode-dependent properties don't apply if their value is a variable

[Tim Horton]

Created attachment 280647 [details]
repro

The two boxes in the attached test case should render identically.

However, the box which has -webkit-padding-start: var(--margin-leading); ends up getting no horizontal padding, because referencing variables in writing-mode/direction-dependent properties does not work.

[Tim Horton]

I did some debugging, and found the point where this goes wrong, but I’m not sure how to fix it.

Once we get into CSSParser::parseVariableDependentValue, our propID is the resolved one (PaddingLeft, for example). The CSSVariableDependentValue still has the unresolved propID (WebkitPaddingStart), though, so the comparison (property.id() == propID) fails, and we end up returning nullptr.

I’m not sure if/when we should be doing the resolution, though. Inside parseVariableDependentValue?

[Radar WebKit Bug Importer]

<rdar://problem/26662478>

[Radar WebKit Bug Importer]

<rdar://problem/26662474>

[Tim Horton]

Created attachment 280928 [details]
Patch

[Simon Fraser (smfr)]

Comment on attachment 280928 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=280928&action=review

> Source/WebCore/css/CSSParser.cpp:1871
>      for (auto& property : m_parsedProperties) {

I would prefer a blank line above this one.

[Tim Horton]

Created attachment 280929 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 280929 [details]
Patch

Clearing flags on attachment: 280929

Committed r201875: <http://trac.webkit.org/changeset/201875>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.