[Webkit-unassigned] [Bug 139476] New: Floats Don't Overhang Their Block Formatting Contex

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=139476

            Bug ID: 139476
           Summary: Floats Don't Overhang Their Block Formatting Contex
    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: jfernandez at igalia.com

Floats Don't Overhang Their Block Formatting Context Per http://www.w3.org/TR/CSS2/visuren.html#float-position: "References to [the elements] in the [rules that govern the behaviour of floats] refer only to other elements in the same block formatting context as the float."

This means we don't need to look for intruding or overhanging floats in boxes that establish a new block formatting context. I couldn't find a test where we failed this rule but we do appear to be doing unnecessary work in rebuildFloatsFromIntruding() so make sure we avoid adding floats from different block formatting contexts.

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