[wp-trac] [WordPress Trac] #33715: Odd spacing issue in Menu and Widget Customize panels when the browser scollbar is visible

[WordPress Trac]

#33715: Odd spacing issue in Menu and Widget Customize panels when the browser
scollbar is visible
--------------------------+-----------------------------
 Reporter:  moonomo       |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Customize     |    Version:  4.3
 Severity:  normal        |   Keywords:
  Focuses:  ui            |
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 To recreate the problem:

 (1) Open customize panels in Firefox (v40.0.3, not sure about other
 version).
 (2) Resize your browser window height until scrollbar become visible.
 (3) Click on 'Menus', or 'Widget Area'.

 On either panel, the content left alignment gets outside the visible area
 a bit (equal to scrollbar width).

 The issue found with Firefox (tested in v40.0.3, Windows 7)- Chrome
 doesn't have the issue.

 If you access child panels (both in menu and widgets panel) and return
 back to it, it works just fine. I've attached image flow of the browser
 rendering issue.

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Ticket URL: <https://core.trac.wordpress.org/ticket/33715>
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