Fix divergence bug when peer reconnects reusing a prior replica id

We forgot to observe the footprint of the reconnecting replica's prior
undos into the local clock. This could cause the replica to generate
edits with a version strictly smaller than what other peers may have
observed. As such, those peers would think they had already seen those
edits and skip them.

Over time, I think we may end up having multiple services, so it seems like a good opportunity to name this one more specifically while the cost is low. It just seems like naming it "zed" and "zed-server" leaves it a bit open ended.

Improve Settings Completions

Introduce structured logging

Introduce separate macro for implementing 'internal' actions which
are not intended to be loaded from keymaps.

Change how actions are declared so that they are always associated with a namespace

Introduce host disconnection in randomized collaboration test

Co-Authored-By: Antonio Scandurra <me@as-cii.com>

We're enabling the log crate feature everywhere, but only using it on the server for now.

Co-Authored-By: Antonio Scandurra <me@as-cii.com>

We have an hypothesis that the server gets stuck while processing
an incoming message, either because the buffer fills up or because
a handler never completes. This should mitigate that and, once we
add logging, give us some clue as to what is causing it exactly.

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

...in contrast to doing so during worktree registration. This fixes a
randomized test failure which would panic because store invariants would be
violated. This would happen when a peer disconnected before it had a chance
to register a worktree because, when removing all the state associated with
that peer upon disconnection, we would notice the registered project without
however finding it in the peer's connection state.

Other code paths rely on at least a version always being there, so
we should enforce that invariant everywhere.

This fixes an error in the randomized test that would cause the future
returned from `Worktree::share` to never finish due to a bug in `postage`
that causes its waker to not be notified upon drop.

Co-authored-by: Nathan Sobo <nathan@zed.dev>
Co-authored-by: Keith Simmons <keith@zed.dev>

Also, allow arbitrary types to be used as Actions via the impl_actions macro

Co-authored-by: Nathan Sobo <nathan@zed.dev>
Co-authored-by: Keith Simmons <keith@zed.dev>

Don't starve UI thread when rapidly receiving LSP messages

Co-Authored-By: Antonio Scandurra <me@as-cii.com>

Calculate hit-box based on visible bounds in `{Mouse}EventHandler`

This is in contrast to not dispatching the event altogether in `Flex` when
the event is not contained in the flex element bounds. That approach was
problematic because it didn't give an opportunity to `MouseEventHandler`s
to handle mouse move events when they didn't intersect with the element bounds,
causing elements to never clear their hover state, cursor style, etc.

Fix bad diagnostic state when restarting a language server w/ a running diagnostic task

Don't assume there are always matches in outline view

Allow pane tabs to be scrolled when they overflow

The bounded channel could fill up when many events were emitted in one
effect cycle.

Update breadcrumbs when multibuffers' excerpts change

Previously, rustfmt seems to have given up on formatting this method.

Don't activate the next pane when opening excerpts

Enable language specific tab sizes

Co-authored-by: Max Brunsfeld <max@zed.dev>