[Webkit-unassigned] [Bug 92163] New: flexitems can overflow the flexbox due to rounding

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=92163

           Summary: flexitems can overflow the flexbox due to rounding
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://plexode.com/eval3/#ht=%3Cdiv%20style%3D%22paddi
                    ng%3A%2010px%3B%20background-color%3A%20black%22%3E%0A
                    %0A%3Cdiv%20style%3D%22display%3A-webkit-flex%3B%20wid
                    th%3A%20101px%3B%20background-color%3A%20grey%22%3E%0A
                    %20%20%3Cdiv%20id%3Da%20style%3D%22-webkit-flex%3A%201
                    %3B%20background-color%3A%20blue%3B%20height%3A%2030px
                    %22%3Ehello%3C%2Fdiv%3E%0A%20%20%3Cdiv%20id%3Db%20styl
                    e%3D%22-webkit-flex%3A%201%3B%20background-color%3A%20
                    yellow%3B%20-webkit-align-self%3Aflex-start%22%3Eworld
                    %3C%2Fdiv%3E%0A%3C%2Fdiv%3E%0A%0A%3C%2Fdiv%3E%0A&jt=ge
                    tComputedStyle(document.getElementById('a')).width%20%
                    2B%20%22%2C%22%20%2B%20getComputedStyle(document.getEl
                    ementById('b')).width%0A
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: tony at chromium.org
                CC: eae at chromium.org, leviw at chromium.org
            Blocks: 62048


Flexbox items don't seem to be getting subpixel positions when rounding.  See the URL for an example.  It's a flexbox that is 101 pixels wide and has 2 children, each should be the same size (50.5px each).  Instead, they are both 51px.

For reference, in RenderFlexibleBox.cpp, we use setOverrideLogicalContent{Width,Height}() to set the width/height of children after we have computed the desired value.  We use setLocation() to position each child.  This happens in RenderFlexibleBox::layoutAndPlaceChildren.

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