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/rpc/src/auth.rs

@@ -1,4 +1,4 @@
-use anyhow::{Context, Result};
+use anyhow::{Context as _, Result};
 use base64::prelude::*;
 use rand::{thread_rng, Rng as _};
 use rsa::pkcs1::{DecodeRsaPublicKey, EncodeRsaPublicKey};

crates/rpc/src/peer.rs

@@ -5,7 +5,7 @@ use super::{
     },
     Connection,
 };
-use anyhow::{anyhow, Context, Result};
+use anyhow::{anyhow, Context as _, Result};
 use collections::HashMap;
 use futures::{
     channel::{mpsc, oneshot},

crates/rpc/src/proto_client.rs

@@ -4,7 +4,7 @@ use futures::{
     future::{BoxFuture, LocalBoxFuture},
     Future, FutureExt as _,
 };
-use gpui::{AnyModel, AnyWeakModel, AsyncAppContext, Model};
+use gpui::{AnyEntity, AnyWeakEntity, AsyncAppContext, Entity};
 use proto::{
     error::ErrorExt as _, AnyTypedEnvelope, EntityMessage, Envelope, EnvelopedMessage,
     RequestMessage, TypedEnvelope,
@@ -53,7 +53,7 @@ pub struct ProtoMessageHandlerSet {
     pub entity_types_by_message_type: HashMap<TypeId, TypeId>,
     pub entities_by_type_and_remote_id: HashMap<(TypeId, u64), EntityMessageSubscriber>,
     pub entity_id_extractors: HashMap<TypeId, fn(&dyn AnyTypedEnvelope) -> u64>,
-    pub models_by_message_type: HashMap<TypeId, AnyWeakModel>,
+    pub models_by_message_type: HashMap<TypeId, AnyWeakEntity>,
     pub message_handlers: HashMap<TypeId, ProtoMessageHandler>,
 }
 
@@ -61,7 +61,7 @@ pub type ProtoMessageHandler = Arc<
     dyn Send
         + Sync
         + Fn(
-            AnyModel,
+            AnyEntity,
             Box<dyn AnyTypedEnvelope>,
             AnyProtoClient,
             AsyncAppContext,
@@ -79,7 +79,7 @@ impl ProtoMessageHandlerSet {
     fn add_message_handler(
         &mut self,
         message_type_id: TypeId,
-        model: gpui::AnyWeakModel,
+        model: gpui::AnyWeakEntity,
         handler: ProtoMessageHandler,
     ) {
         self.models_by_message_type.insert(message_type_id, model);
@@ -139,7 +139,7 @@ impl ProtoMessageHandlerSet {
 }
 
 pub enum EntityMessageSubscriber {
-    Entity { handle: AnyWeakModel },
+    Entity { handle: AnyWeakEntity },
     Pending(Vec<Box<dyn AnyTypedEnvelope>>),
 }
 
@@ -207,11 +207,11 @@ impl AnyProtoClient {
         self.0.send(envelope, T::NAME)
     }
 
-    pub fn add_request_handler<M, E, H, F>(&self, model: gpui::WeakModel<E>, handler: H)
+    pub fn add_request_handler<M, E, H, F>(&self, model: gpui::WeakEntity<E>, handler: H)
     where
         M: RequestMessage,
         E: 'static,
-        H: 'static + Sync + Fn(Model<E>, TypedEnvelope<M>, AsyncAppContext) -> F + Send + Sync,
+        H: 'static + Sync + Fn(Entity<E>, TypedEnvelope<M>, AsyncAppContext) -> F + Send + Sync,
         F: 'static + Future<Output = anyhow::Result<M::Response>>,
     {
         self.0.message_handler_set().lock().add_message_handler(
@@ -243,7 +243,7 @@ impl AnyProtoClient {
     where
         M: EnvelopedMessage + RequestMessage + EntityMessage,
         E: 'static,
-        H: 'static + Sync + Send + Fn(gpui::Model<E>, TypedEnvelope<M>, AsyncAppContext) -> F,
+        H: 'static + Sync + Send + Fn(gpui::Entity<E>, TypedEnvelope<M>, AsyncAppContext) -> F,
         F: 'static + Future<Output = anyhow::Result<M::Response>>,
     {
         let message_type_id = TypeId::of::<M>();
@@ -289,7 +289,7 @@ impl AnyProtoClient {
     where
         M: EnvelopedMessage + EntityMessage,
         E: 'static,
-        H: 'static + Sync + Send + Fn(gpui::Model<E>, TypedEnvelope<M>, AsyncAppContext) -> F,
+        H: 'static + Sync + Send + Fn(gpui::Entity<E>, TypedEnvelope<M>, AsyncAppContext) -> F,
         F: 'static + Future<Output = anyhow::Result<()>>,
     {
         let message_type_id = TypeId::of::<M>();