Currently, the `aria-expanded` attribute is placed on the checkbox
element. However, since Ife287fc8c6e0d2aee5facf42d5d4308dea918ee3, the
checkbox is excluded from the accessibility tree, and this attribute
should be placed on the label button instead.
This commit prepares for future changes [1] to the checkbox hack interface
in a backwards compatible way:
* Passes button to `updateAriaExpanded` function
* Passes button to `bindUpdateAriaExpandedOnInput` function
[1] Ia2755e189babbd70945b66a1a812fc3ece40b577
Change-Id: Icc6ba994d57ea1f8050aa408aebc8c81f03d8783
Add a menu button that toggles the panel's (also referred to as a
sidebar) collapse state. When the screen is wide enough, animate the
transition.
The menu icon from OOUI is copied into Vector to avoid two
ResourceLoaders modules (collapseHorizontal icon isn't ready for
inclusion in the OOUI icon pack and ResourceLoaderOOUIIconPackModule
doesn't support images).
Additional polish and collaboration is needed but this patch fulfills
the scope of its referenced task.
Bug: T246419
Depends-On: I8e153c0ab927f9d880a68fb9efb0bf37b91d26b2
Change-Id: Ic9d54de7e19ef8d5dfd703d95a45b78c0aaf791a
