…ion (#13365)

Refactor search results and improve their display. Add display of when we make spelling corrections.

Adds filtering results to the widget sidebar. Filters are not yet interactive.

…13393)

bugs fixed:
- Long titles and text will no longer overlap the date in the results.
- Count of total results will never get overlapped by very long search strings
- Adds icons for different content types to give more context to the user: products, video, images, audio, code, etc (eventually we could let users click to filter on these too)
- Does not show path when we have tags/categories - was taking up too much space

* Use underscores instead of camel case
* Add support for filtering by tags and categories

Extract the sort settings from the URL and then use that to determine how results should be sorted when doing the api request.

Prerequisite for adding support for the sorting selection dropdown.

* Implement support for date filters
* Add support for modified and GMT filter options
* Remove duplicate post tag filter logic
* Remove querying for 'modified' field

* Add internal dependencies docblock
* Add support for custom taxonomy filtering
* Refactor handling of query strings (coupled to API logic)

* Add sort widget

* Display list of sort options

* Pre-select current sort from query string

* Update sort options

* Reflect sort selection in query string

* Sorting works! Renamed getSearchSort to getSortQuery for consistency

* Tidying

* Add translation context

Co-Authored-By: Greg Ichneumon Brown <greg@automattic.com>

* Add jetpack context to all translations

* Address review feedback

Fixes many of the problems in #13391 particularly:

- inserting results into the theme works in all those themes
- the search form for all those themes works as search as you type as does the default core WP search widget
- Adds some CSS for our search box and cleans it up
- Adjust opacity when results are loading to give the user some feedback
- Starts the search query after only 200ms rather than 500ms. Feels a lot snappier
- Did some slight code cleanup and renamed the "widget" to "app" so it isn't confused with the WP widgets.

* Initial working version of infinite scroll
* Add scroll check for infinite scrolling experience
* Fix discrepancies from rebase
* Pass response along as a property
* Enable aggregations for non-paged requests
* Preserve aggregations for paged response
* Fix pagination bug

Simple 5 min caching layer to all api requests.

* Reduce icons in results.
* Clean up filter styling.
* Min height on results area so the window shouldn't bounce.
* Fix zerif-lite theme
* Slightly reduce spacing between checkbox and label in filters

Insert search and filter results onto the front end of any theme. Filters are always displayed. Woohoo!

This change adds TrainTracks analytics to Jetpack Instant Search.

…earch-master

These changes are unrelated to Jetpack Instant Search.