Commits on May 13, 2021

1. rustdoc: use focus for search navigation …

   Rather than keeping track of highlighted element inside the JS, take
   advantage of `.focus()` and the :focus CSS pseudo-class.
   
   This required wrapping each row of results in one big <a> tag (because
   anchors can be focused, but table rows cannot). That in turn required
   moving from a table layout to a div layout with float.
   
   This makes it so Ctrl+Enter opens links in new tabs, and using the arrow
   keys to navigate off the bottom of the page scrolls the rest of the page
   into view. It also simplifies the keyboard event handling. It eliminates
   the need for click handlers on the search results, and for tracking
   mouse movements.
   
   This changes the UI treatment of mouse hovering. A hovered element now
   gets a light grey background, but does not change the focused element.
   It's possible to have two highlighted search results: one that is
   focused (via keyboard) and one that is hovered (via mouse). Pressing
   enter will activate the focused link; clicking will activate the hovered
   link. This matches up with how Firefox and Chrome handle suggestions in
   their URL bar, and avoids stray mouse movements changing the focus.
   
   Selecting tabs is now done with left/right arrows while any search
   result is focused. The visibility of results on each search tab is
   controlled with the "active" class, rather than by setting display: none
   directly. Note that the old code kept track of highlighted search
   element when tabbing back and forth. The new code doesn't.

   

   jsha committed May 13, 2021
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