Eliminate GPUI View, ViewContext, and WindowContext types (#22632)

There's still a bit more work to do on this, but this PR is compiling
(with warnings) after eliminating the key types. When the tasks below
are complete, this will be the new narrative for GPUI:

- `Entity<T>` - This replaces `View<T>`/`Model<T>`. It represents a unit
of state, and if `T` implements `Render`, then `Entity<T>` implements
`Element`.
- `&mut App` This replaces `AppContext` and represents the app.
- `&mut Context<T>` This replaces `ModelContext` and derefs to `App`. It
is provided by the framework when updating an entity.
- `&mut Window` Broken out of `&mut WindowContext` which no longer
exists. Every method that once took `&mut WindowContext` now takes `&mut
Window, &mut App` and every method that took `&mut ViewContext<T>` now
takes `&mut Window, &mut Context<T>`

Not pictured here are the two other failed attempts. It's been quite a
month!

Tasks:

- [x] Remove `View`, `ViewContext`, `WindowContext` and thread through
`Window`
- [x] [@cole-miller @mikayla-maki] Redraw window when entities change
- [x] [@cole-miller @mikayla-maki] Get examples and Zed running
- [x] [@cole-miller @mikayla-maki] Fix Zed rendering
- [x] [@mikayla-maki] Fix todo! macros and comments
- [x] Fix a bug where the editor would not be redrawn because of view
caching
- [x] remove publicness window.notify() and replace with
`AppContext::notify`
- [x] remove `observe_new_window_models`, replace with
`observe_new_models` with an optional window
- [x] Fix a bug where the project panel would not be redrawn because of
the wrong refresh() call being used
- [x] Fix the tests
- [x] Fix warnings by eliminating `Window` params or using `_`
- [x] Fix conflicts
- [x] Simplify generic code where possible
- [x] Rename types
- [ ] Update docs

### issues post merge

- [x] Issues switching between normal and insert mode
- [x] Assistant re-rendering failure
- [x] Vim test failures
- [x] Mac build issue



Release Notes:

- N/A

---------

Co-authored-by: Antonio Scandurra <me@as-cii.com>
Co-authored-by: Cole Miller <cole@zed.dev>
Co-authored-by: Mikayla <mikayla@zed.dev>
Co-authored-by: Joseph <joseph@zed.dev>
Co-authored-by: max <max@zed.dev>
Co-authored-by: Michael Sloan <michael@zed.dev>
Co-authored-by: Mikayla Maki <mikaylamaki@Mikaylas-MacBook-Pro.local>
Co-authored-by: Mikayla <mikayla.c.maki@gmail.com>
Co-authored-by: joão <joao@zed.dev>

crates/ui/src/components/keybinding.rs

@@ -1,7 +1,7 @@
 #![allow(missing_docs)]
 use crate::PlatformStyle;
 use crate::{h_flex, prelude::*, Icon, IconName, IconSize};
-use gpui::{relative, Action, FocusHandle, IntoElement, Keystroke, WindowContext};
+use gpui::{relative, Action, App, FocusHandle, IntoElement, Keystroke, Window};
 
 #[derive(Debug, IntoElement, Clone)]
 pub struct KeyBinding {
@@ -18,8 +18,12 @@ pub struct KeyBinding {
 impl KeyBinding {
     /// Returns the highest precedence keybinding for an action. This is the last binding added to
     /// the keymap. User bindings are added after built-in bindings so that they take precedence.
-    pub fn for_action(action: &dyn Action, cx: &mut WindowContext) -> Option<Self> {
-        let key_binding = cx.bindings_for_action(action).into_iter().rev().next()?;
+    pub fn for_action(action: &dyn Action, window: &mut Window) -> Option<Self> {
+        let key_binding = window
+            .bindings_for_action(action)
+            .into_iter()
+            .rev()
+            .next()?;
         Some(Self::new(key_binding))
     }
 
@@ -27,9 +31,9 @@ impl KeyBinding {
     pub fn for_action_in(
         action: &dyn Action,
         focus: &FocusHandle,
-        cx: &mut WindowContext,
+        window: &mut Window,
     ) -> Option<Self> {
-        let key_binding = cx
+        let key_binding = window
             .bindings_for_action_in(action, focus)
             .into_iter()
             .rev()
@@ -76,7 +80,7 @@ impl KeyBinding {
 }
 
 impl RenderOnce for KeyBinding {
-    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+    fn render(self, _window: &mut Window, cx: &mut App) -> impl IntoElement {
         h_flex()
             .debug_selector(|| {
                 format!(
@@ -152,7 +156,7 @@ pub struct Key {
 }
 
 impl RenderOnce for Key {
-    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
+    fn render(self, _window: &mut Window, cx: &mut App) -> impl IntoElement {
         let single_char = self.key.len() == 1;
 
         div()
@@ -187,7 +191,7 @@ pub struct KeyIcon {
 }
 
 impl RenderOnce for KeyIcon {
-    fn render(self, _cx: &mut WindowContext) -> impl IntoElement {
+    fn render(self, _window: &mut Window, _cx: &mut App) -> impl IntoElement {
         Icon::new(self.icon)
             .size(IconSize::XSmall)
             .color(Color::Muted)
@@ -201,8 +205,8 @@ impl KeyIcon {
 }
 
 /// Returns a textual representation of the key binding for the given [`Action`].
-pub fn text_for_action(action: &dyn Action, cx: &WindowContext) -> Option<String> {
-    let bindings = cx.bindings_for_action(action);
+pub fn text_for_action(action: &dyn Action, window: &Window) -> Option<String> {
+    let bindings = window.bindings_for_action(action);
     let key_binding = bindings.last()?;
     Some(text_for_key_binding(key_binding, PlatformStyle::platform()))
 }
@@ -212,9 +216,9 @@ pub fn text_for_action(action: &dyn Action, cx: &WindowContext) -> Option<String
 pub fn text_for_action_in(
     action: &dyn Action,
     focus: &FocusHandle,
-    cx: &mut WindowContext,
+    window: &mut Window,
 ) -> Option<String> {
-    let bindings = cx.bindings_for_action_in(action, focus);
+    let bindings = window.bindings_for_action_in(action, focus);
     let key_binding = bindings.last()?;
     Some(text_for_key_binding(key_binding, PlatformStyle::platform()))
 }