[Webkit-unassigned] [Bug 203800] New: [LFC][MarginCollapsing] Add Line::isConsideredEmpty

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203800

            Bug ID: 203800
           Summary: [LFC][MarginCollapsing] Add Line::isConsideredEmpty
           Product: WebKit
           Version: WebKit 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
                CC: bfulgham at webkit.org, koivisto at iki.fi,
                    simon.fraser at apple.com,
                    webkit-bug-importer at group.apple.com, zalan at apple.com

https://www.w3.org/TR/CSS22/visuren.html#inline-formatting
Line boxes that contain no text, no preserved white space, no inline elements with non-zero margins, padding, or borders,
and no other in-flow content (such as images, inline blocks or inline tables), and do not end with a preserved newline
must be treated as zero-height line boxes for the purposes of determining the positions of any elements inside of them,
and must be treated as not existing for any other purpose.

Note that it does not necessarily mean visually non-empty line. <span style="font-size: 0px">this is still considered non-emptyine</span>

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