[Webkit-unassigned] [Bug 144879] New: Text is misplaced when custom font does not have space glyph.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=144879

            Bug ID: 144879
           Summary: Text is misplaced when custom font does not have space
                    glyph.
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zalan at apple.com

BreakingContext and RenderText::computePreferredLogicalWidths() pre-calculates space width and if the associated font does not have space glyph we initiate a fallback font even if the text does not need it. Since both the primary and the fallback fonts are used to figure out ascent/descent information for lines, if the fallback fonts' ascent/descent values are bigger, the line gets misplaced. (as opposed to where it would be placed, if the primary font had space glyph)

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