Customizer Menus: Accordion toggle in available menu items panel fails on first attempt after a search

[tywayne]

Steps to reproduce:

1. Click Add Items when editing a menu
2. Use the search field, doesn't matter if it returns results or not.
3. Attempt to toggle one of the accordion items below.

gif of process here: ​https://cloudup.com/c2w8vM4sheu

[tywayne]

After looking further, it appears this is happening because we're triggering debounceSearch on both the input and change events. Is there a reason we need to trigger a search on both of those events? The change event is firing when the input loses focus, thus opening the search results again.

Removing the change event in api.Menus.AvailableMenuItemsPanelView seems to fix it, but it may be there for a reason I'm not seeing.

[ocean90]

Related comment by @aferica: ​https://wordpress.slack.com/archives/core-customize/p1434409353000585

[ocean90]

In 32824:

Customizer: Fix keyboard events for the menu items search field.

Replace the change event with keyup, see https://core.trac.wordpress.org/ticket/26600#comment:59 for background.

props tywayne.
fixes #32677.