Co-authored-by: Conrad <conrad@zed.dev>

Bring back some workspace tests

Co-authored-by: Conrad <conrad@zed.dev>

Rework gpui2 drag API so that receivers need not specify the dragged
view type.

co-authored-by: Conrad <conrad@zed.dev>

Rework gpui2 drag API so that receivers need not specify the dragged view type.

co-authored-by: Max <max@zed.dev>
co-authored-by: Conrad <conrad@zed.dev>

This PR styles the "Replace in project" input in the project search.

Release Notes:

- N/A

Co-Authored-By: Marshall Bowers <1486634+maxdeviant@users.noreply.github.com>

Fixes clicking in the top/bottom 100px of the editor


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This PR styles the inputs in the project search.

<img width="772" alt="Screenshot 2023-12-14 at 1 53 28 PM"
src="https://github.com/zed-industries/zed/assets/1486634/fe2362be-79db-4551-a473-2acf7a8a1bcb">

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This PR makes the toolbar hide itself if it has no visible items.

This removes the double border beneath the tab bar when there are no
visible tools in the toolbar.

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* Ensure that scroll events from blocks scroll the editor
* Ensure that scroll bars show behind hover things

This PR builds on top of #3652 by adding a selection prompt to the
storybook to allow you to choose from the available list of stories if
you don't provide one explicitly:

<img width="1387" alt="Screenshot 2023-12-14 at 12 00 26 PM"
src="https://github.com/zed-industries/zed/assets/1486634/640d62a3-1340-45f1-9746-69b513faff62">

This way we don't have to keep generating the `script/storybook` script
whenever stories are added/removed.

#### Usage (through `cargo`):

```sh
# Select from the available stories
cargo run -p storybook2

# Run a specific story
cargo run -p storybook2 -- components/list_item
```

#### Usage (through `script/storybook`):

```sh
# Select from the available stories
./script/storybook

# Run a specific story
./script/storybook list_item
```

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[[PR Description]]

This PR adds the ability to run stories with `script/storybook`.

Running it directly will give you a selector like this:

```zsh
➜  zed git:(add-storybook-script) script/storybook
1) auto_height_editor	 9) icon		17) scroll
2) avatar		10) icon_button		18) tab
3) button		11) keybinding		19) tab_bar
4) checkbox		12) label		20) text
5) context_menu		13) list		21) viewport_units
6) cursor		14) list_header		22) z_index
7) disclosure		15) list_item		23) picker
8) focus		16) overflow_scroll
```

You can also provide a value like:

`script/storybook {STORY_NAME}` - Example: `script/storybook text`

OR 

`script/storybook components/{STORY_NAME}` - Example: `script/storybook
components/text`

I just wanted an easier way to interface with stories quickly to make
using them a bit easier, and enable discovery of what exists easier with
the selector.

This was a really quick hack, in the future we can extend this to a
proper CLI.

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We've noticed how leaving a call with multiple windows open would still
prompt with the popup along the lines of "Do you want to leave the
current call?". In Zed1, that popup only showed up when you've had just
one window open.

The code for prompting did not change at all between zed1 and zed2, but
the way we calculate the window count did. Calling AppContext::windows
to get all window handles from WindowContext::update essentially
excluded the window we were updating (that is the window being closed)
from the returned Vec of window handles. I've decided to keep the code
as close to original as possible (as the alternative would be to change
the \# of workspaces needed for a prompt to pop up). We now query the
window handles via a deref to AsyncAppContext, which does not exclude
"our" window handle from the returned results.

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Header and footer are gonna be added in a separate PR as they require
changes to Picker trait that I feel are separate from the contents of
this PR.

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This PR changes project search bar's flex axis to `column`.

This fixes an issue where toggling the filters would cause the search
controls to center themselves vertically instead of staying next to the
search input.

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Doesn't quite work yet

This PR:
- Fixes several bugs with dock resizing
- Adds a new drag move API for resizes 
- Adds special debug styling for elements, including auto-opening Zed at
the element's location in source
- Changes the `cx.paint_quad()` API to take a type and adds several
helpers to create this type.
- Adds `()` as the empty element, and uses it to implement a derive
macro for the `Render` trait.

Release Notes:

- N/A

- Cleans up modal state logic by using an enum over multiple booleans
- Simulates sending feedback in dev mode, so UI can be easily tested

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- N/A