assistant: Add model selector to the Context Editor (#25032)

This PR also removes everything related with the model selector from the
Context Editor toolbar.

Release Notes:

- N/A

crates/assistant/src/assistant_panel.rs

@@ -7,7 +7,7 @@ use assistant_context_editor::{
     make_lsp_adapter_delegate, AssistantContext, AssistantPanelDelegate, ContextEditor,
     ContextEditorToolbarItem, ContextEditorToolbarItemEvent, ContextHistory, ContextId,
     ContextStore, ContextStoreEvent, InsertDraggedFiles, SlashCommandCompletionProvider,
-    ToggleModelSelector, DEFAULT_TAB_TITLE,
+    DEFAULT_TAB_TITLE,
 };
 use assistant_settings::{AssistantDockPosition, AssistantSettings};
 use assistant_slash_command::SlashCommandWorkingSet;
@@ -21,7 +21,6 @@ use gpui::{
 };
 use language::LanguageRegistry;
 use language_model::{LanguageModelProviderId, LanguageModelRegistry, ZED_CLOUD_PROVIDER_ID};
-use language_model_selector::LanguageModelSelector;
 use project::Project;
 use prompt_library::{open_prompt_library, PromptBuilder, PromptLibrary};
 use search::{buffer_search::DivRegistrar, BufferSearchBar};
@@ -29,7 +28,7 @@ use settings::{update_settings_file, Settings};
 use smol::stream::StreamExt;
 use std::{ops::ControlFlow, path::PathBuf, sync::Arc};
 use terminal_view::{terminal_panel::TerminalPanel, TerminalView};
-use ui::{prelude::*, ContextMenu, PopoverMenu, PopoverMenuHandle, Tooltip};
+use ui::{prelude::*, ContextMenu, PopoverMenu, Tooltip};
 use util::{maybe, ResultExt};
 use workspace::DraggedTab;
 use workspace::{
@@ -77,7 +76,6 @@ pub struct AssistantPanel {
     languages: Arc<LanguageRegistry>,
     fs: Arc<dyn Fs>,
     subscriptions: Vec<Subscription>,
-    model_selector_menu_handle: PopoverMenuHandle<LanguageModelSelector>,
     model_summary_editor: Entity<Editor>,
     authenticate_provider_task: Option<(LanguageModelProviderId, Task<()>)>,
     configuration_subscription: Option<Subscription>,
@@ -119,17 +117,9 @@ impl AssistantPanel {
         window: &mut Window,
         cx: &mut Context<Self>,
     ) -> Self {
-        let model_selector_menu_handle = PopoverMenuHandle::default();
         let model_summary_editor = cx.new(|cx| Editor::single_line(window, cx));
-        let context_editor_toolbar = cx.new(|cx| {
-            ContextEditorToolbarItem::new(
-                workspace,
-                model_selector_menu_handle.clone(),
-                model_summary_editor.clone(),
-                window,
-                cx,
-            )
-        });
+        let context_editor_toolbar =
+            cx.new(|_| ContextEditorToolbarItem::new(model_summary_editor.clone()));
 
         let pane = cx.new(|cx| {
             let mut pane = Pane::new(
@@ -331,7 +321,6 @@ impl AssistantPanel {
             languages: workspace.app_state().languages.clone(),
             fs: workspace.app_state().fs.clone(),
             subscriptions,
-            model_selector_menu_handle,
             model_summary_editor,
             authenticate_provider_task: None,
             configuration_subscription: None,
@@ -1054,15 +1043,6 @@ impl AssistantPanel {
         .detach_and_log_err(cx);
     }
 
-    fn toggle_model_selector(
-        &mut self,
-        _: &ToggleModelSelector,
-        window: &mut Window,
-        cx: &mut Context<Self>,
-    ) {
-        self.model_selector_menu_handle.toggle(window, cx);
-    }
-
     pub(crate) fn active_context_editor(&self, cx: &App) -> Option<Entity<ContextEditor>> {
         self.pane
             .read(cx)
@@ -1229,7 +1209,6 @@ impl Render for AssistantPanel {
             }))
             .on_action(cx.listener(AssistantPanel::deploy_history))
             .on_action(cx.listener(AssistantPanel::deploy_prompt_library))
-            .on_action(cx.listener(AssistantPanel::toggle_model_selector))
             .child(registrar.size_full().child(self.pane.clone()))
             .into_any_element()
     }