Part of
https://linear.app/zed-industries/issue/Z-2750/investigate-performance-of-collaborating-on-large-files-with-inlay
Fixes
https://linear.app/zed-industries/issue/Z-2824/inlay-hints-affect-code-layout-in-multibuffer

We query hints for visible part of the screen, and two parts above and
below the visible range, of the same range (if applicable, we can be on
the edge of the document).

When rapidly typing, we do not care about the invisible range updates,
yet still query a lot of them + rust-analyzer sends /refresh hint
requests shortly after every modification too, forcing us to re-query.

Instead querying both visible and invisible ranges altogether, wait for
visible range query first and wait add a `400ms` delay afterwards before
querying the invisible ranges.
This allows any /refresh requests or rapid typing to avoid 2 extra
requests, cancelling them before they start.
Visible part of the screen is still queried after every change, without
any debouncing.

Release Notes:

- Delay certain inlay hint requests to reduce general LSP server load

This way, only the visible part gets frequently queried on typing (and
hint /refresh requests that follow), with queries for invisible ranges
cancelled eagerly.

Resolves inlay hints on hover, shows hint label parts' tooltips, allows
cmd+click to navigate to the hints' parts with locations,
correspondingly highlight the hints.

Release Notes:

- Support dynamic inlay hints

Often, hint ranges are separated by a single '<` char as in
`Option<Vec<u32>>`. When moving the caret from left to right, avoid
inclusive ranges to faster update the matching hint underline.

Co-Authored-By: Antonio <antonio@zed.dev>

Without holding all hints in host's cache, this is impossile.
Currenly, we keep hint caches separate and isolated, so this will not
work when we actually resolve.

Optimization to the Semantic Indexing Engine.

We've transitioned from a framework in which the entire project tree is
walked at each index command, to an eager queuing method, in which an
initial queue of outstanding indexing work is initialized upon workspace
creation, and then subscriptions are leveraged for file change events to
continually keep an updated view on outstanding work.

This optimization contributes towards quicker user feedback, when
initializing or using Semantic Search functionality. It also opens the
doors towards better transparency across the system on outstanding
indexing work.

Release Notes:

- Refactored index operation queue to an eager queuing framework.
- Moved semantic search initialization to workspace creation.
- Adjusted rate limiting strategy on api delays to reduce time spent
waiting for rate limits.

Now that the filters are hidden behind a toggle-able setting, running
the `Search Inside` action from the project panel feels a bit weird,
since the filter being used is hidden. This PR automatically opens that
filter section after running a `Search Inside` action.

Release Notes:

- N/A

![Screen Shot 2023-08-24 at 5 26 53
PM](https://github.com/zed-industries/zed/assets/326587/3e84c5a6-1aaf-4335-a880-4c32eb83332d)

### Todo

* [x] Snapshot channel buffers when everyone closes the buffer
* [x] Ensure that users who are in both a project and a channel note
have the same color in both places
* [x] Allow following project collaborators into channel notes
* [x] Expose notes for the current channel under "Current Call" section
of the collaboration panel
* [x] Offline state for the channel notes view
* [x] Make the channel context menu accessible to all members (to expose
the notes)
* [x] Wire in view and Item method overrides

Release Notes:

- N/A

Co-authored-by: Mikayla <mikayla@zed.dev>

Co-authored-by: Mikayla <mikayla@zed.dev>

Co-authored-by: Mikayla <mikayla@zed.dev>

Co-authored-by: Mikayla <mikayla@zed.dev>