[wp-trac] [WordPress Trac] #30208: Twenty Fifteen: expanding a sub-menu when the sidebar is fixed needs to conditionally unfix the sidebar

[WordPress Trac]

#30208: Twenty Fifteen: expanding a sub-menu when the sidebar is fixed needs to
conditionally unfix the sidebar
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 Reporter:  celloexpressions  |      Owner:
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  Bundled Theme     |    Version:  trunk
 Severity:  normal            |   Keywords:  needs-patch
  Focuses:  ui                |
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 Decided it would be better not to reopen #29979 at this point due to its
 length, but the associated code needs to account for this case. If it's
 short enough that the sidebar is fixed, but you staart opening submenus,
 you are unable to scroll the sidebar. This can potentially make it
 impossible to access certain submenu items on certain screen sizes, which
 site owners will not necessarily realize since it may be okay on their
 screen sizes. Reproducible on http://twentyfifteendemo.wordpress.com/.

 FWIW I'm still not a fan of this approach - going with something that also
 partially fixes the sidebar when it overflows would avoid this issue. If
 you're scrolled down the page when you run into this and the sidebar
 unfixes, it'll have to jump to the top, out of view.

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Ticket URL: <https://core.trac.wordpress.org/ticket/30208>
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