Inlined input queries (was: display search line instead of link line)

[johnwcowan]

Currently, when you click on a search link (e.g. to GUS), a text box with OK and Cancel appears near the top of the window. Instead, what about displaying it in place of the link line itself? Visually, this could be a text box placed after the right-pointing arrowhead and followed by small icons ✅ and ❌ (or whatever icons you prefer). If you hit ❌ or reload the page, the link line is redisplayed. This would be more compact and eliminate unnecessary scrolling.

[skyjake]

I have been thinking of doing something like this, although there are a couple of usability issues to consider. DocumentWidget has problems with query URLs when back/forward navigating over them. These should be addressed also to make the query UI behave more seamlessly.

[skyjake]

There is another very much related issue: #375