focus wrong for unchanged search after mousing over search results

[ijackson]

This one is a relatively minor bug, since it only happens if you try to search for the same thing you are looking at, which is not a very natural thing to do. But I thought I would report it anyway.

Steps to reproduce

1. Go to the front page of the std results from rustdoc
2. Click in the search box at the top of the page
3. Type in assert (as an example search term) and hit Return
4. If your rustdoc version has the bug rustdoc help popup appears in every new tab when no web local storage #79960, and you have cookies disabled or are viewing the docs via a file:// url, click anywhere outside the help popup to dismiss it
5. See that some search results are displayed.
6. Move the mouse pointer over the search results. A moving highlight is displayed.
7. Move the mouse pointer over the search box, and left click, to focus the search box
8. Hit return to search for the same thing again

Expected results

The same search is performed again, so the page reloads with little change.

Actual results

Whatever search result you last moused over, which has the highlight shown, is visited.

@rustdoc modify labels +T-rustdoc -A-rustdoc-ui

[ijackson]

@rustdoc modify labels +T-rustdoc -A-rustdoc-ui

[ijackson]

@rustdoc modify labels +T-rustdoc +A-rustdoc-ui

[ijackson]

@rustbot modify labels +T-rustdoc -A-rustdoc-ui

[ijackson]

@rustbot modify labels +A-rustdoc-ui

Sorry for the rustbot flail!

[GuillaumeGomez]

This is a tricky issue because you're supposed to be able to "click" on an item without moving the mouse by using up and down arrows and then press return. So, what I suggest is that in case you give back the focus to the search input, we clear the currently focused item.

Also: rustdoc doesn't run the search if it's the same input.

[jsha]

Related #84384.

Another way to accomplish this would be to base the up/down arrow selection on focus. Then when you click in the search box, that would take focus away from the item that had been highlighted. Mouse movements wouldn't update focus.