[Webkit-unassigned] [Bug 152821] New: [GTK] css-multicol-1 tests failing since r188947

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=152821

            Bug ID: 152821
           Summary: [GTK] css-multicol-1 tests failing since r188947
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at igalia.com
                CC: simon.fraser at apple.com

The following tests have been failing for GTK since r188947:

imported/w3c/css/css-multicol-1/multicol-basic-001.html [ ImageOnlyFailure ]
imported/w3c/css/css-multicol-1/multicol-basic-002.html [ ImageOnlyFailure ]
imported/w3c/css/css-multicol-1/multicol-basic-003.html [ ImageOnlyFailure ]
imported/w3c/css/css-multicol-1/multicol-basic-004.html [ ImageOnlyFailure ]
imported/w3c/css/css-multicol-1/multicol-rule-002.xht [ ImageOnlyFailure ]
imported/w3c/css/css-multicol-1/multicol-rule-px-001.xht [ ImageOnlyFailure ]
imported/w3c/css/css-multicol-1/multicol-rule-stacking-001.xht [ ImageOnlyFailure ]
imported/w3c/css/css-multicol-1/multicol-shorthand-001.xht [ ImageOnlyFailure ]
imported/w3c/css/css-multicol-1/multicol-span-all-block-sibling-003.xht [ ImageOnlyFailure ]
imported/w3c/css/css-multicol-1/multicol-span-all-margin-nested-firstchild-001.xht [ ImageOnlyFailure ]

I should note that all the .xht tests print the word "FAIL FAIL FAIL" repeatedly, but the expected results include "FAIL FAIL FAIL" as well, so that problem is unrelated to this bug. That is probably that we are treating the .xht files as HTML rather than XHTML, bug #152455. In this bug I am only concerned with the pixel differences introduced by r188947.

I have no clue why r188947 fixed pixel differences on Macs but introduced them on Linux.

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