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/project/src/task_inventory.rs

@@ -8,9 +8,9 @@ use std::{
     sync::Arc,
 };
 
-use anyhow::{Context, Result};
+use anyhow::{Context as _, Result};
 use collections::{HashMap, HashSet, VecDeque};
-use gpui::{AppContext, Context as _, Model, Task};
+use gpui::{App, AppContext as _, Entity, Task};
 use itertools::Itertools;
 use language::{ContextProvider, File, Language, LanguageToolchainStore, Location};
 use settings::{parse_json_with_comments, SettingsLocation};
@@ -76,8 +76,8 @@ impl TaskSourceKind {
 }
 
 impl Inventory {
-    pub fn new(cx: &mut AppContext) -> Model<Self> {
-        cx.new_model(|_| Self::default())
+    pub fn new(cx: &mut App) -> Entity<Self> {
+        cx.new(|_| Self::default())
     }
 
     /// Pulls its task sources relevant to the worktree and the language given,
@@ -88,7 +88,7 @@ impl Inventory {
         file: Option<Arc<dyn File>>,
         language: Option<Arc<Language>>,
         worktree: Option<WorktreeId>,
-        cx: &AppContext,
+        cx: &App,
     ) -> Vec<(TaskSourceKind, TaskTemplate)> {
         let task_source_kind = language.as_ref().map(|language| TaskSourceKind::Language {
             name: language.name().0,
@@ -115,7 +115,7 @@ impl Inventory {
         worktree: Option<WorktreeId>,
         location: Option<Location>,
         task_context: &TaskContext,
-        cx: &AppContext,
+        cx: &App,
     ) -> (
         Vec<(TaskSourceKind, ResolvedTask)>,
         Vec<(TaskSourceKind, ResolvedTask)>,
@@ -371,7 +371,7 @@ fn task_variables_preference(task: &ResolvedTask) -> Reverse<usize> {
 
 #[cfg(test)]
 mod test_inventory {
-    use gpui::{Model, TestAppContext};
+    use gpui::{Entity, TestAppContext};
     use itertools::Itertools;
     use task::TaskContext;
     use worktree::WorktreeId;
@@ -381,7 +381,7 @@ mod test_inventory {
     use super::TaskSourceKind;
 
     pub(super) fn task_template_names(
-        inventory: &Model<Inventory>,
+        inventory: &Entity<Inventory>,
         worktree: Option<WorktreeId>,
         cx: &mut TestAppContext,
     ) -> Vec<String> {
@@ -396,7 +396,7 @@ mod test_inventory {
     }
 
     pub(super) fn register_task_used(
-        inventory: &Model<Inventory>,
+        inventory: &Entity<Inventory>,
         task_name: &str,
         cx: &mut TestAppContext,
     ) {
@@ -416,7 +416,7 @@ mod test_inventory {
     }
 
     pub(super) async fn list_tasks(
-        inventory: &Model<Inventory>,
+        inventory: &Entity<Inventory>,
         worktree: Option<WorktreeId>,
         cx: &mut TestAppContext,
     ) -> Vec<(TaskSourceKind, String)> {
@@ -438,11 +438,11 @@ mod test_inventory {
 /// A context provided that tries to provide values for all non-custom [`VariableName`] variants for a currently opened file.
 /// Applied as a base for every custom [`ContextProvider`] unless explicitly oped out.
 pub struct BasicContextProvider {
-    worktree_store: Model<WorktreeStore>,
+    worktree_store: Entity<WorktreeStore>,
 }
 
 impl BasicContextProvider {
-    pub fn new(worktree_store: Model<WorktreeStore>) -> Self {
+    pub fn new(worktree_store: Entity<WorktreeStore>) -> Self {
         Self { worktree_store }
     }
 }
@@ -453,7 +453,7 @@ impl ContextProvider for BasicContextProvider {
         location: &Location,
         _: Option<HashMap<String, String>>,
         _: Arc<dyn LanguageToolchainStore>,
-        cx: &mut AppContext,
+        cx: &mut App,
     ) -> Task<Result<TaskVariables>> {
         let buffer = location.buffer.read(cx);
         let buffer_snapshot = buffer.snapshot();
@@ -553,7 +553,7 @@ impl ContextProvider for ContextProviderWithTasks {
     fn associated_tasks(
         &self,
         _: Option<Arc<dyn language::File>>,
-        _: &AppContext,
+        _: &App,
     ) -> Option<TaskTemplates> {
         Some(self.templates.clone())
     }
@@ -859,7 +859,7 @@ mod tests {
     }
 
     async fn resolved_task_names(
-        inventory: &Model<Inventory>,
+        inventory: &Entity<Inventory>,
         worktree: Option<WorktreeId>,
         cx: &mut TestAppContext,
     ) -> Vec<String> {
@@ -888,7 +888,7 @@ mod tests {
     }
 
     async fn list_tasks_sorted_by_last_used(
-        inventory: &Model<Inventory>,
+        inventory: &Entity<Inventory>,
         worktree: Option<WorktreeId>,
         cx: &mut TestAppContext,
     ) -> Vec<(TaskSourceKind, String)> {