[wp-trac] [WordPress Trac] #37013: Minor Fixes: "Toggle indicator" in pages have focus color while the same in widgets/menus have none.

[WordPress Trac]

#37013: Minor Fixes: "Toggle indicator" in pages have focus color while the same in
widgets/menus have none.
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 Reporter:  monikarao                            |       Owner:  afercia
     Type:  defect (bug)                         |      Status:  assigned
 Priority:  normal                               |   Milestone:  4.9
Component:  Widgets                              |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch has-screenshots needs-     |     Focuses:  ui,
  testing                                        |  accessibility
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Comment (by afercia):

 I think the best path to help this ticket move on is splitting the changes
 in the widgets screen from the ones in the menus screen.

 Menus screen: `do_accordion_sections()' is something that plugins may use
 too, and any change there should be carefully considered; will split this
 part in a new ticked.

 Widgets screen: there are a few more things to take into considerations.
 For example, when there are more than on sidebar, only the first one is
 open by default and the other ones are closed:

 [[Image(https://cldup.com/XgAM7qmVNW.png)]]

 Thus, the `aria-expanded` attribute on the toggle buttons must be updated
 on page load accordingly. When dragging a widget from one sidebar to
 another sidebar, the related panels open and close: also in this case,
 `aria-expanded` needs to be updated accordingly. Basically every time the
 sidebar containers `closed` CSS class gets added/removed, the `aria-
 expanded` attribute needs to be updated to reflect the container
 expanded/collapsed state.

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Ticket URL: <https://core.trac.wordpress.org/ticket/37013#comment:29>
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