Menu: Use consistent styling for focused and "active" items

[Jörn Zaefferer]

We currently style active parent menu items with "ui-state-active", while everything else gets "ui-state-focus" (or hover, which we style the same as focus). When a menu item in a submenu has focus, the parent menu item gets "ui-state-active", which is inconsistent and confusing.

We probably shouldn't use "ui-state-active" in menu at all.

From this discussion: ​https://github.com/jquery/jquery-ui/pull/1384#issuecomment-62140254

[Jörn Zaefferer]

Somewhat related, the documentation mentions "active item" a lot. Maybe we should apply "ui-state-active" everywhere? If not, maybe we need to change the documentation to use "focus" or "focused" consistently.

[Jörn Zaefferer]

This is what the menu, with the new base theme applied, currently looks like: ​http://bassistance.de/i/e8f9a2.png

If we were to use ui-state-focus consistently, we'd get this: ​http://bassistance.de/i/3dac32.png (here the triangle icon switches to white, which looks bad)

If we'd use ui-state-active instead, we'd get this: ​http://bassistance.de/i/1940f0.png

I prefer the last option. It matches the menus on OSX.

[Jörn Zaefferer]

I brought this up in the #css-chassis channel. After some discussion, the consensus was to use ui-state-active for both parent and child. I'll look into implementing that. Its definitely more than just replacing ui-state-focus with ui-state-active everywhere in menu.js.

[Jörn Zaefferer]

Also discussed this at the weekly meeting last Wednesday, also agreed to use ui-state-active there. Created a PR to implement that: ​https://github.com/jquery/jquery-ui/pull/1429

[Jörn Zaefferer]

Menu: Use ui-state-active consistently

So far we were using ui-state-active on active parent items, ui-state-focus on active child items. The theme update highlighted the visual inconsistency. With this change, only ui-state-active is used.

Fixes #10692

Changeset: 0bbd1569182bc03e8dc4f5f8aa203e8edbe15f99