The biggest improvements come from preventing element moves where
unnecessary, and when they are absolutely needed, try to make the struct
we're moving as small as possible. Having big structs on the stack (such
as `Interactivity`) increases the cost of moving but also reduces
opportunities for other compiler optimizations (e.g., inlining).

One more notable change was using `FxHashMap` and `FxHashSet` in hot
code paths where we don't need those collections to be resistant to DoS.

Another thing I am seeing a lot in the profiler is interacting with
`StackingOrder` (cloning it, searching for it, inserting into the
`Scene`). I have some thoughts on how to optimize that but I punted on
it because performance seems to be pretty good now.

Release Notes:

- N/A

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

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

Part of
https://linear.app/zed-industries/issue/Z-1386/add-equivalent-setting-to-vscodes-auto-reveal-exclude
Deals with https://github.com/zed-industries/community/issues/800

* add a `project_panel::auto_reveal_entries` config entry to allow
disabling auto reveal in project panel (auto reveal is enabled by
default)
* add a `pane::RevealInProjectPanel` action (and a pane tab context menu
entry) to manually reveal any file entry
* stop auto revealing gitignored directories at all

We can add the auto reveal exclude globs later, if needed, but let's try
to keep the config simpler and start with a more minimalist approach.

Release Notes:

- Improved project panel auto reveal mechanics: gitignored files are not
auto revealed anymore; a `auto_reveal_entries = true` config option for
`project_panel` is added; a `pane::RevealInProjectPanel` action and a
corresponding buffer tab context menu were added

We can also use these maps and sets in place of `SeaHasher` because
they are also deterministic. Note that we're not swapping std's
`HashMap` and `HashSet` wholesale inside of `collections` because
on the server we need cryptographically secure collections.

* gitignored entries are never auto revealed
* `project_panel::auto_reveal_entries = true` settings entry was added,
setting it to `false` will disable the auto reveal
* `pane::RevealInProjectPanel` action was added that activates the project panel and reveals the entry it got triggered on (including the gitignored ones)

Also, fix a bug that prevented drag and drop from working in the collab
panel.

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

This PR is a first pass at styling the welcome screen in Zed2.

Here's the current state:

<img width="1237" alt="Screenshot 2023-12-11 at 7 00 43 PM"
src="https://github.com/zed-industries/zed/assets/1486634/a0cbd5ca-7331-4785-bf46-f83fc4cb3bb6">

Release Notes:

- N/A

- MOAR TESTS

[[PR Description]]

Release Notes:

- N/A

This PR adds `w_vw` and `h_vh` methods to `StyledExt`.

These methods are the same as their `w` and `h` counterparts, but
operate in viewport units, giving us the equivalent of `vw` and `vh` in
CSS.

You can see them in action in this story:

```
cargo run -p storybook2 -- components/viewport_units
```

Release Notes:

- N/A

For some reason in gpui2, the window contains an extra 59px of space..

Still needs styling.

Still needs styling.

This PR makes it so the `theme_importer` falls back to the inactive tab
background color if the theme doesn't not an active tab background
color.

This fixes the active tab color in the Synthwave 84 theme.

Release Notes:

- N/A

This PR adjusts the colors we pull from the VS Code themes to use for
the scrollbar track background and border.

For the scrollbar track background we now use the `editor.background`,
and for the scrollbar track border we use `editorOverviewRuler.border`.

Release Notes:

- N/A

- First round of vim tests

Add `observe_keystrokes` back to gpui2
Allow multiple actions to match a given key event

[[PR Description]]

Release Notes:

- (Added|Fixed|Improved) ...
([#<public_issue_number_if_exists>](https://github.com/zed-industries/community/issues/<public_issue_number_if_exists>)).

Making this PR to upstream changes to util and GPUI2, resizing exists
but isn't working yet.

Release Notes:

- N/A

GPUI (both 1 and 2) currently performs rendering, layout, and painting
at the end of every effect cycle. This leads to poor performance when
the app receives events more frequently than the display refreshes. Such
rapid events can come from a terminal, an LSP, or a mouse with a high
polling rate.

This PR changes GPUI so that we don't render until the OS notifies us
that the content will be presented, via the `displayLayer:` callback.

Because render, layout, and paint have side effects that are sometimes
relied on in tests, we currently keep the old behavior (drawing after
every effects cycle) in tests.

This is similar to what @ForLoveOfCats explored in
https://github.com/zed-industries/zed/pull/3542, but slightly simpler,
in that we're not using the display link. As a follow-up, we could use
the display link to start rendering earlier, to possibly reduce latency
further.

This PR updates the `theme_importer` to pull in the
`tab.inactiveForeground` color from VS Code to use as the muted text
color.

Release Notes:

- N/A

This PR fixes the inactive tab style to properly show the label using
the muted text color.

I went about fixing this in the most direct way possible, but the
solution leaves a lot to be desired, IMO. I plan to explore some ideas
on how we can improve the state of styling the tab content without
having the same styles repeated all over the place and subsequently
out-of-sync.

Release Notes:

- N/A

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