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/semantic_index/src/embedding_index.rs

@@ -10,7 +10,7 @@ use fs::Fs;
 use fs::MTime;
 use futures::{stream::StreamExt, FutureExt as _};
 use futures_batch::ChunksTimeoutStreamExt;
-use gpui::{AppContext, Model, Task};
+use gpui::{App, Entity, Task};
 use heed::types::{SerdeBincode, Str};
 use language::LanguageRegistry;
 use log;
@@ -22,7 +22,7 @@ use util::ResultExt;
 use worktree::Snapshot;
 
 pub struct EmbeddingIndex {
-    worktree: Model<Worktree>,
+    worktree: Entity<Worktree>,
     db_connection: heed::Env,
     db: heed::Database<Str, SerdeBincode<EmbeddedFile>>,
     fs: Arc<dyn Fs>,
@@ -33,7 +33,7 @@ pub struct EmbeddingIndex {
 
 impl EmbeddingIndex {
     pub fn new(
-        worktree: Model<Worktree>,
+        worktree: Entity<Worktree>,
         fs: Arc<dyn Fs>,
         db_connection: heed::Env,
         embedding_db: heed::Database<Str, SerdeBincode<EmbeddedFile>>,
@@ -56,10 +56,7 @@ impl EmbeddingIndex {
         &self.db
     }
 
-    pub fn index_entries_changed_on_disk(
-        &self,
-        cx: &AppContext,
-    ) -> impl Future<Output = Result<()>> {
+    pub fn index_entries_changed_on_disk(&self, cx: &App) -> impl Future<Output = Result<()>> {
         if !cx.is_staff() {
             return async move { Ok(()) }.boxed();
         }
@@ -80,7 +77,7 @@ impl EmbeddingIndex {
     pub fn index_updated_entries(
         &self,
         updated_entries: UpdatedEntriesSet,
-        cx: &AppContext,
+        cx: &App,
     ) -> impl Future<Output = Result<()>> {
         if !cx.is_staff() {
             return async move { Ok(()) }.boxed();
@@ -99,7 +96,7 @@ impl EmbeddingIndex {
         .boxed()
     }
 
-    fn scan_entries(&self, worktree: Snapshot, cx: &AppContext) -> ScanEntries {
+    fn scan_entries(&self, worktree: Snapshot, cx: &App) -> ScanEntries {
         let (updated_entries_tx, updated_entries_rx) = channel::bounded(512);
         let (deleted_entry_ranges_tx, deleted_entry_ranges_rx) = channel::bounded(128);
         let db_connection = self.db_connection.clone();
@@ -183,7 +180,7 @@ impl EmbeddingIndex {
         &self,
         worktree: Snapshot,
         updated_entries: UpdatedEntriesSet,
-        cx: &AppContext,
+        cx: &App,
     ) -> ScanEntries {
         let (updated_entries_tx, updated_entries_rx) = channel::bounded(512);
         let (deleted_entry_ranges_tx, deleted_entry_ranges_rx) = channel::bounded(128);
@@ -227,7 +224,7 @@ impl EmbeddingIndex {
         &self,
         worktree_abs_path: Arc<Path>,
         entries: channel::Receiver<(Entry, IndexingEntryHandle)>,
-        cx: &AppContext,
+        cx: &App,
     ) -> ChunkFiles {
         let language_registry = self.language_registry.clone();
         let fs = self.fs.clone();
@@ -277,7 +274,7 @@ impl EmbeddingIndex {
     pub fn embed_files(
         embedding_provider: Arc<dyn EmbeddingProvider>,
         chunked_files: channel::Receiver<ChunkedFile>,
-        cx: &AppContext,
+        cx: &App,
     ) -> EmbedFiles {
         let embedding_provider = embedding_provider.clone();
         let (embedded_files_tx, embedded_files_rx) = channel::bounded(512);
@@ -359,7 +356,7 @@ impl EmbeddingIndex {
         &self,
         deleted_entry_ranges: channel::Receiver<(Bound<String>, Bound<String>)>,
         embedded_files: channel::Receiver<(EmbeddedFile, IndexingEntryHandle)>,
-        cx: &AppContext,
+        cx: &App,
     ) -> Task<Result<()>> {
         let db_connection = self.db_connection.clone();
         let db = self.db;
@@ -397,7 +394,7 @@ impl EmbeddingIndex {
         })
     }
 
-    pub fn paths(&self, cx: &AppContext) -> Task<Result<Vec<Arc<Path>>>> {
+    pub fn paths(&self, cx: &App) -> Task<Result<Vec<Arc<Path>>>> {
         let connection = self.db_connection.clone();
         let db = self.db;
         cx.background_executor().spawn(async move {
@@ -413,11 +410,7 @@ impl EmbeddingIndex {
         })
     }
 
-    pub fn chunks_for_path(
-        &self,
-        path: Arc<Path>,
-        cx: &AppContext,
-    ) -> Task<Result<Vec<EmbeddedChunk>>> {
+    pub fn chunks_for_path(&self, path: Arc<Path>, cx: &App) -> Task<Result<Vec<EmbeddedChunk>>> {
         let connection = self.db_connection.clone();
         let db = self.db;
         cx.background_executor().spawn(async move {