[Webkit-unassigned] [Bug 251009] New: InlineTextBoxes containing Zero Width Joiner, Zero Width Non-Joiner , or  Zero Width No-Break Space must not use simplified text measuring

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251009

            Bug ID: 251009
           Summary: InlineTextBoxes containing Zero Width Joiner, Zero
                    Width Non-Joiner , or  Zero Width No-Break Space must
                    not use simplified text measuring
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: vitaly at igalia.com
                CC: mmaxfield at apple.com

When calculating the width of an InlineTexBox using simplified measuring, we simply sum up the width of every glyph. Some fonts (at least FreeType fonts) specify the non-zero width of `Zero Width Joiner`, `Zero Width Non-Joiner`, and `Zero Width No-Break Space`. Later, during the rendering, these glyphs are skipped causing the `InlineTextBox`es to become wider than they should be.

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