This PR tweaks the positioning of the mute indicators so that they cover
a little bit less of the avatar:

#### Before

<img width="305" alt="Screenshot 2024-01-16 at 6 32 51 PM"
src="https://github.com/zed-industries/zed/assets/1486634/3f6ad2f4-2c3e-498b-97a4-8b522f3ceda9">

#### After

<img width="311" alt="Screenshot 2024-01-16 at 6 26 48 PM"
src="https://github.com/zed-industries/zed/assets/1486634/37161557-084d-4b69-b61f-a0958e8e867c">

(It's a bit hard to tell in the screenshot, but there is a gap between
the bottom of the indicator and the top of the color ribbon).

Release Notes:

- N/A

Always attempt to flush after the timeout period.

Release Notes:

- N/A

We're occasionally seeing a crash in MetalRenderer::draw.

Looking at the backtrace, it seems almost certainly to be happening in
the call to `ptr::copy_nonoverlapping` on line 604 (see `#Don't Panic!`
channel notes)

As we already have added bounds checking to the destination, it seems
most
likely (however improbable) that somehow we're getting an invalid Ptr
and
length from the SmallVec.

To try and make progress on this, let's try a Vec for a bit lest there
is a subtle issue in SmallVec (though I couldn't spot one).


Release Notes:

- (maybe) Fixes SEGFAULT in MetalRenderer::draw

This PR increases the width of the border that we use to indicate when a
call participant is speaking.

This should make it more apparent in the UI when someone is speaking.

Release Notes:

- Increased the width of the ring used to indicate when someone is
speaking in a call.

[[PR Description]]

Release Notes:

- Adds Channels, a new mechanism for collaboration. [Read
More...](https://zed.dev/blog/channels)

- Close modals when focus leaves
- Disallow self-management for admins

Release Notes:

- Fixes changing role of invited channel members

This PR improves the muted indicators to make it clearer when a call
participant is muted.

Previously we used a red border color to denote when a participant was
muted.

Now we render an indicator with an icon to more clearly indicate the
participant's muted status:

<img width="303" alt="Screenshot 2024-01-16 at 4 05 15 PM"
src="https://github.com/zed-industries/zed/assets/1486634/d30fcd84-48e7-4959-b3c4-1054162c6bd6">

Hovering over the indicator will display a tooltip for further
explanation:

<img width="456" alt="Screenshot 2024-01-16 at 4 05 25 PM"
src="https://github.com/zed-industries/zed/assets/1486634/6345846f-196c-47d9-8d65-c8d86e63f823">

This change also paves the way for denoting the deafened status for call
participants.

Release Notes:

- Improved the mute indicator for call participants.

This PR adds a color ribbon for the local player in the current call.

This fixes the alignment of the local user's avatar so that it lines up
with the rest of the collaborators in the call:

<img width="307" alt="Screenshot 2024-01-16 at 2 56 04 PM"
src="https://github.com/zed-industries/zed/assets/1486634/979ee3fa-70c9-482a-9351-020402ad68b9">

Release Notes:

- Added a color ribbon for the local player when in a call.

This PR reworks the way we add indicators to `Avatar`s to make them more
general-purpose.

Previously we had logic specific to the availability indicator embedded
in the `Avatar` component, which made it unwieldy to repurpose for
something else.

Now the `indicator` is just a slot that we can put anything into.

Release Notes:

- N/A

This adjusts the solution in
https://github.com/zed-industries/zed/pull/4014 to fix the double-focus
issue, allowing each pane's project search to work independently.

Release Notes:

- Changed the name of the `workspace::DeploySearch` action to
`pane::DeploySearch` and changed it's behavior to open a new search OR
focus an existing project search in the current pane.
(https://github.com/zed-industries/community/issues/2395)

This fixes block headers overlapping over text in the buffer when using
a custom line height of 1.25.

It fixes the issue by making the parent container a v-flex,
vertically-justifying the content and moving from relative padding to
absolute padding for the header itself.

## Before/After

With setting:
```json
  "buffer_line_height": {
    "custom": 1.25
  },
```

### Before

![screenshot-2024-01-16-16 48
48@2x](https://github.com/zed-industries/zed/assets/1185253/8c3b977e-333f-403c-a4d3-0911f3fac5e0)

### After

![screenshot-2024-01-16-16 50
13@2x](https://github.com/zed-industries/zed/assets/1185253/2d854eba-c4c4-4bce-b60b-dd250856b08f)

### Release notes
Release Notes:

- Fixed headers in multi-buffers overlapping over content of the buffer

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

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

This fixes block headers overlapping over text in the buffer when using
a custom line height of 1.25.

It fixes the issue by making the parent container a v-flex,
vertically-justifying the content and moving from relative padding to
absolute padding for the header itself.

Co-authored-by: antonio <antonio@zed.dev>
Co-authored-by: julia <julia@zed.dev>
Co-authored-by: marshall <marshall@zed.dev>

This reverts commit 5904bcf1c20638d63b244a1b2b038ec9a664ba1c.

Release Notes:

- N/A

This reverts commit 5904bcf1c20638d63b244a1b2b038ec9a664ba1c.

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

This contains two changes in order to hopefully avoid the panic we saw
in #panics:

```
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value'
crates/gpui/src/platform/mac/display.rs:30
<backtrace::capture::Backtrace as core::fmt::Debug>::fmt
<backtrace::capture::Backtrace as core::fmt::Debug>::fmt
Zed::init_panic_hook::{closure#0}
std::panicking::rust_panic_with_hook
std::panicking::rust_panic_with_hook
std::sys_common::backtrace::output_filename
<std::panicking::begin_panic_handler::FormatStringPayload as core::panic::PanicPayload>::take_box
core::panicking::panic_fmt
core::panicking::panic
gpui::platform::mac::display::display_bounds_to_native
<gpui::platform::mac::window::MacWindow as gpui::platform::PlatformWindow>::bounds
<gpui::window::WindowContext>::window_bounds_changed
<gpui::window::Window>::new::{closure#1}
gpui::platform::mac::window::view_did_change_backing_properties
<gpui::platform::mac::platform::MacPlatform as gpui::platform::Platform>::run
Zed::main
<core::marker::PhantomData<core::option::Option<Zed::LocationData>> as serde::de::DeserializeSeed>::deserialize::<&mut serde_json::de::Deserializer<serde_json::read::StrRead>>
workspace::open_new::<Zed::restore_or_create_workspace::{closure#0}::{closure#0}::{closure#0}::{closure#2}::{closure#0}>::{closure#0}::{closure#0}
std::rt::lang_start_internal
serde_json::de::from_trait::<serde_json::read::StrRead, core::option::Option<Zed::Panic>>
```

Two changes:
* Reduce the number of calls to `CGGetActiveDisplayList` in the hopes
that this will also reduce chances of it returning an empty list.
Previously, in the worst case, we called it 6 times. Now the worst case
is that we call it 3 times.
* Instead of calling `CGGetActiveDisplayList` to get the primary display
we do what Chromium does and construct the primary display from
NSScreen.

Release Notes:

- Fixed a bug that caused a panic that could happen when Zed attempted
to render on a sleeping display.

According to Chromium source, `NSScreen::screens` should always get us
one display.

We made this change because we ran into panics caused by the previous
`unwrap()` when `CGGetActiveDisplayList` might return an empty list.

Previously we called CGGetActiveDisplayList twice: once to get the
number of displays and then to get the displays.

We saw a panic due to no displays being returned here. As a first
attempt to fix the panic, we're reducing the amount of calls to
CGGetActiveDisplayList and just do one with the trade-off being that we
pre-allocate 32 pointers in a Vec.

Fixes `[2024-01-16T09:21:54Z ERROR util]
crates/theme/src/settings.rs:172: theme not found: One Light` error from
the log after
https://github.com/zed-industries/zed/commit/d84785f7e8519b30e474385e5a72f5726cf4783e

Release Notes:

- N/A

Deals with https://github.com/zed-industries/community/issues/2374

Release Notes:

- Added a way to select items under multiple carets with
`editor::SelectNext` and `editor::SelectPrevious` commands

This is more similar to zed1's behaviour, and allows us to work around
the difficulty in defining `on_mouse_down_out` for modals that have
overlays.

Release Notes:

- N/A

Now that views are cached, we need to explicitly `.notify()` text
editors when the buffer font size changes.

* [x] Notify editors when settings change, or adjusting buffer font size
* [x] Figure out why non-focused editors still do not re-render when
adjusting buffer font size
* [x] Reset buffer font size adjustment when the size is updated in the
user's settings

As this is used if you mis-spell "buffer_font_family", it should be
monospace.

Also treat "Zed Mono" and "Zed Sans" as valid fonts

Follow up to #4045

Release Notes:

- Fixes font validation to allow "Zed Mono" as a valid font

Release Notes:

- Fixed a bug where the 'deafen' button would only apply to audio from
the call's current participants, but not any participants who joined
after the button was pressed.
- Fixed a bug where after being granted write access to a channel, the
microphone icon appeared non-muted, even though audio was not shared.