Thanks for all your feedback, it is really useful. Some comments  below:

Regarding the progress indicator:
Regarding search behaviour:
  • The idea is to avoid hidding content when searching but highlight matches over the current content instead. This approach has advantages (there is no context switch and matches are seen in their real context) and disadvantages (on a long conversation text that is not related to the search terms is still there). To compensate the disadvantages some navigation aids are provided: scrolling automatically to the first match, an overview of the highlighted areas, options to move to previous and next matches and a filtered ToC to view just those topics with results. I think that making search to hide content would be problematic (we may be creating the need to go back and forth between modes), but is worth trying if we see that users found it strange that topics without matches remain there.
  • For the filtered ToC I was planning to add an explicit mention that there are X other topics that don't match the search. That could help to avoid the confusion of not getting a complete ToC when searching.
  • I agree that the default browser in-page search won't work on infinite scroll and accessing it may be confusing, but we need to be especially careful when overriding default browser behaviour. So I would consider it when once we've identified it is an issue (e.g., by instrumenting how often ctrl+g/f happens on flow boards when flow-search is active and when it is not).
Regarding the ToC:
  • I think it makes sense to highlight the topics I'm connected with (those I starred, or participated) as well as those with relevant content (content with new activity). I think that search is a good opportunity to learn about those usecases but if those are useful we want to add them on both since the user is looking for topics in both cases so there is no reason to break consistency. 
  • Regarding the use of space and showing ToC and content both at the same time, I think those are two separate issues. I think that we'll have many opportunities to make better use of space with relevant information (if not when supporting ToC, with other feature).
    I'm especially interested in which scenarios it would be useful to have both visible at the same time, and how would affect users the consequences of having less space for the ToC (showing topic titles cropped, or less of them).
    In the current status of talk pages the ToC just appears at the beginning showing the full-titles, which takes most of the real state in long conversations and there is not an easy way to go back to it once you get immersed into the conversations. Do we have info on bugs/requests/comments from our users that illustrate more details about the navigation between topics and content?

Pau

On Sat, Nov 22, 2014 at 10:25 PM, Hhhippo ... <hhhipppo@gmail.com> wrote:
Hi all,

Re: TOC on the top
I see your points: having the title of the currently displayed topic hovering on the top is indeed nice. And expanding this same line into a TOC also feels right. But the combination of the two means that you can see either the TOC or the board, but not both. And that feels very wrong to me. I'd prefer having a similar, a bit more compact version of the whole thing floating on the right side.
This might be to some extent a matter of 'taste': just like some people prefer step-by-step driving instructions while others prefer a route indicated on a map, there's also different ways of navigating a web page that work best for different people. So the answer could be to make it configurable. By user preference, skin, custom css or - my preferred option - a switch on the UI, comparable to the show/hide switch on article TOCs. One could then maybe collect usage data to see how popular each display style is, and how frequently people switch.

Re: Whitespace on the right
A nice start would be to change the behavior for small browser widths: when reducing the width, the first step should be to gradually reduce the whitespace all the way to zero, then reduce the board width, and then the font size. Currently there seems to be some kind of requirement of a certain minimum amount of whitespace, which is only dropped once the font size is reduced.
That said, the current behavior is exactly what we wanted if there was something useful in that space (hint, hint ;-)

Re: Showing similar data in regular TOC
+1

Re: Will < > be used?
Definitely, at least the ">". That's what people do with the browser's search function on non-infinite pages. It would be great to map this function to Ctrl-G. (Actually, this might be a 'must have': otherwise Ctrl-G will repeat the latest native browser search within the loaded content, which is confusing if you did another search in between.)

Re: Infinite scrolling / loading topics
In the prototype, topics without search results are hidden from the toc, but still shown on the board. Will that be different in the real version (the board then showing only topics with hits)? I think it should.
I agree that the scrolling-up issue is independent of searching or other filters, but there's also a potential search-specific problem here: the set of topics to be shown can change drastically with every keystroke in the search bar. Maybe the reduction of the board to showing only topics with results should only happen when pressing enter in the bar?

Best wishes
Hhhippo

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Pau Giner
Interaction Designer
Wikimedia Foundation