Bug 126657

Summary:	Subpixel layout: RenderTableCell with middle vertical alignment and visible scrollbar needs bias centering.
Product:	WebKit	Reporter:	zalan <zalan>
Component:	Layout and Rendering	Assignee:	zalan <zalan>
Status:	RESOLVED INVALID
Severity:	Normal	CC:	jonlee, simon.fraser, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	528+ (Nightly build)
Hardware:	Unspecified
OS:	Unspecified
Bug Depends on:
Bug Blocks:	126283

Description zalan 2014-01-08 13:01:38 PST

RenderTableCell::scrollbarsChanged() calculates the before padding for the table cell which pushes the content off by one CSS pixel when subpixel is off. 

LayoutUnit newBeforePadding = (totalHeight - heightWithoutIntrinsicPadding) / 2;

failed test case:
fast/table/overflowHidden.html

Comment 1 Simon Fraser (smfr) 2014-01-08 15:29:11 PST

Prefer subpixel.

Comment 2 Radar WebKit Bug Importer 2014-01-14 10:23:27 PST

<rdar://problem/15815542>