[Webkit-unassigned] [Bug 138167] New: display: table-cell; bug when resizing window

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=138167

            Bug ID: 138167
           Summary: display: table-cell; bug when resizing window
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Macintosh Intel
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkit at rebertia.com

Created attachment 240594
  --> https://bugs.webkit.org/attachment.cgi?id=240594&action=review
Relevant screenshots; (C) is the problem

Original Bootstrap bug: https://github.com/twbs/bootstrap/issues/9774

To repro:
1. Open http://jsbin.com/laracu/2 in Safari.
2. Ensure that the window is fairly wide, such that the nav menu displays horizontally (screenshot A). If not, resize the window to be wider and reload the webpage.
2. Resize the window to be narrower, until the nav menu starts displaying vertically (screenshot B).
3. Resize the window to be wider, until the nav menu stops displaying vertically.
4. Observe that the nav menu hasn't returned to its original, expected appearance (screenshot A; i.e. one row of evenly spaced items), but instead displays as two rows, the first having 4 items and the second having two items (screenshot C).

Happens on Safari version 8.0 (10600.1.25) on OS X Yosemite.
(Incidentally, OS X 10.10 isn't available as an option in the "OS" field of this Bugzilla for some reason.)

Chrome and Safari render the nav menu correctly in these circumstances. Chrome used to also exhibit this same bug, but has since fixed it.

Possibly related to https://bugs.webkit.org/show_bug.cgi?id=113839 and/or https://bugs.webkit.org/show_bug.cgi?id=53166

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