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/repl/src/repl_store.rs

@@ -3,9 +3,7 @@ use std::sync::Arc;
 use anyhow::Result;
 use collections::HashMap;
 use command_palette_hooks::CommandPaletteFilter;
-use gpui::{
-    prelude::*, AppContext, EntityId, Global, Model, ModelContext, Subscription, Task, View,
-};
+use gpui::{prelude::*, App, Context, Entity, EntityId, Global, Subscription, Task};
 use jupyter_websocket_client::RemoteServer;
 use language::Language;
 use project::{Fs, Project, WorktreeId};
@@ -16,14 +14,14 @@ use crate::kernels::{
 };
 use crate::{JupyterSettings, KernelSpecification, Session};
 
-struct GlobalReplStore(Model<ReplStore>);
+struct GlobalReplStore(Entity<ReplStore>);
 
 impl Global for GlobalReplStore {}
 
 pub struct ReplStore {
     fs: Arc<dyn Fs>,
     enabled: bool,
-    sessions: HashMap<EntityId, View<Session>>,
+    sessions: HashMap<EntityId, Entity<Session>>,
     kernel_specifications: Vec<KernelSpecification>,
     selected_kernel_for_worktree: HashMap<WorktreeId, KernelSpecification>,
     kernel_specifications_for_worktree: HashMap<WorktreeId, Vec<KernelSpecification>>,
@@ -33,8 +31,8 @@ pub struct ReplStore {
 impl ReplStore {
     const NAMESPACE: &'static str = "repl";
 
-    pub(crate) fn init(fs: Arc<dyn Fs>, cx: &mut AppContext) {
-        let store = cx.new_model(move |cx| Self::new(fs, cx));
+    pub(crate) fn init(fs: Arc<dyn Fs>, cx: &mut App) {
+        let store = cx.new(move |cx| Self::new(fs, cx));
 
         store
             .update(cx, |store, cx| store.refresh_kernelspecs(cx))
@@ -43,11 +41,11 @@ impl ReplStore {
         cx.set_global(GlobalReplStore(store))
     }
 
-    pub fn global(cx: &AppContext) -> Model<Self> {
+    pub fn global(cx: &App) -> Entity<Self> {
         cx.global::<GlobalReplStore>().0.clone()
     }
 
-    pub fn new(fs: Arc<dyn Fs>, cx: &mut ModelContext<Self>) -> Self {
+    pub fn new(fs: Arc<dyn Fs>, cx: &mut Context<Self>) -> Self {
         let subscriptions = vec![cx.observe_global::<SettingsStore>(move |this, cx| {
             this.set_enabled(JupyterSettings::enabled(cx), cx);
         })];
@@ -88,11 +86,11 @@ impl ReplStore {
         self.kernel_specifications.iter()
     }
 
-    pub fn sessions(&self) -> impl Iterator<Item = &View<Session>> {
+    pub fn sessions(&self) -> impl Iterator<Item = &Entity<Session>> {
         self.sessions.values()
     }
 
-    fn set_enabled(&mut self, enabled: bool, cx: &mut ModelContext<Self>) {
+    fn set_enabled(&mut self, enabled: bool, cx: &mut Context<Self>) {
         if self.enabled == enabled {
             return;
         }
@@ -101,7 +99,7 @@ impl ReplStore {
         self.on_enabled_changed(cx);
     }
 
-    fn on_enabled_changed(&self, cx: &mut ModelContext<Self>) {
+    fn on_enabled_changed(&self, cx: &mut Context<Self>) {
         if !self.enabled {
             CommandPaletteFilter::update_global(cx, |filter, _cx| {
                 filter.hide_namespace(Self::NAMESPACE);
@@ -120,8 +118,8 @@ impl ReplStore {
     pub fn refresh_python_kernelspecs(
         &mut self,
         worktree_id: WorktreeId,
-        project: &Model<Project>,
-        cx: &mut ModelContext<Self>,
+        project: &Entity<Project>,
+        cx: &mut Context<Self>,
     ) -> Task<Result<()>> {
         let kernel_specifications = python_env_kernel_specifications(project, worktree_id, cx);
         cx.spawn(move |this, mut cx| async move {
@@ -139,7 +137,7 @@ impl ReplStore {
 
     fn get_remote_kernel_specifications(
         &self,
-        cx: &mut ModelContext<Self>,
+        cx: &mut Context<Self>,
     ) -> Option<Task<Result<Vec<KernelSpecification>>>> {
         match (
             std::env::var("JUPYTER_SERVER"),
@@ -161,7 +159,7 @@ impl ReplStore {
         }
     }
 
-    pub fn refresh_kernelspecs(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
+    pub fn refresh_kernelspecs(&mut self, cx: &mut Context<Self>) -> Task<Result<()>> {
         let local_kernel_specifications = local_kernel_specifications(self.fs.clone());
 
         let remote_kernel_specifications = self.get_remote_kernel_specifications(cx);
@@ -201,7 +199,7 @@ impl ReplStore {
         &mut self,
         worktree_id: WorktreeId,
         kernelspec: KernelSpecification,
-        _cx: &mut ModelContext<Self>,
+        _cx: &mut Context<Self>,
     ) {
         self.selected_kernel_for_worktree
             .insert(worktree_id, kernelspec);
@@ -211,7 +209,7 @@ impl ReplStore {
         &self,
         worktree_id: WorktreeId,
         language_at_cursor: Option<Arc<Language>>,
-        cx: &AppContext,
+        cx: &App,
     ) -> Option<KernelSpecification> {
         let selected_kernelspec = self.selected_kernel_for_worktree.get(&worktree_id).cloned();
 
@@ -226,7 +224,7 @@ impl ReplStore {
     fn kernelspec_legacy_by_lang_only(
         &self,
         language_at_cursor: Arc<Language>,
-        cx: &AppContext,
+        cx: &App,
     ) -> Option<KernelSpecification> {
         let settings = JupyterSettings::get_global(cx);
         let selected_kernel = settings
@@ -270,11 +268,11 @@ impl ReplStore {
             .cloned()
     }
 
-    pub fn get_session(&self, entity_id: EntityId) -> Option<&View<Session>> {
+    pub fn get_session(&self, entity_id: EntityId) -> Option<&Entity<Session>> {
         self.sessions.get(&entity_id)
     }
 
-    pub fn insert_session(&mut self, entity_id: EntityId, session: View<Session>) {
+    pub fn insert_session(&mut self, entity_id: EntityId, session: Entity<Session>) {
         self.sessions.insert(entity_id, session);
     }