agent_ui: Remove custom "unavailable editing" tooltip (#44992)

Now that we can use `Tooltip::element`, we don't need a separate
file/component just for this.

Release Notes:

- N/A

crates/agent_ui/src/acp/thread_view.rs

@@ -63,10 +63,7 @@ use crate::acp::message_editor::{MessageEditor, MessageEditorEvent};
 use crate::agent_diff::AgentDiff;
 use crate::profile_selector::{ProfileProvider, ProfileSelector};
 
-use crate::ui::{
-    AgentNotification, AgentNotificationEvent, BurnModeTooltip, UnavailableEditingTooltip,
-    UsageCallout,
-};
+use crate::ui::{AgentNotification, AgentNotificationEvent, BurnModeTooltip, UsageCallout};
 use crate::{
     AgentDiffPane, AgentPanel, AllowAlways, AllowOnce, ContinueThread, ContinueWithBurnMode,
     CycleModeSelector, ExpandMessageEditor, Follow, KeepAll, NewThread, OpenAgentDiff, OpenHistory,
@@ -2091,10 +2088,23 @@ impl AcpThreadView {
                                                     .icon_size(IconSize::Small)
                                                     .icon_color(Color::Muted)
                                                     .style(ButtonStyle::Transparent)
-                                                    .tooltip(move |_window, cx| {
-                                                        cx.new(|_| UnavailableEditingTooltip::new(agent_name.clone()))
-                                                            .into()
-                                                    })
+                                                    .tooltip(Tooltip::element({
+                                                        move |_, _| {
+                                                            v_flex()
+                                                                .gap_1()
+                                                                .child(Label::new("Unavailable Editing")).child(
+                                                                    div().max_w_64().child(
+                                                                        Label::new(format!(
+                                                                            "Editing previous messages is not available for {} yet.",
+                                                                            agent_name.clone()
+                                                                        ))
+                                                                        .size(LabelSize::Small)
+                                                                        .color(Color::Muted),
+                                                                    ),
+                                                                )
+                                                                .into_any_element()
+                                                        }
+                                                    }))
                                             )
                                     )
                                 }

crates/agent_ui/src/ui.rs

@@ -5,7 +5,7 @@ mod claude_code_onboarding_modal;
 mod end_trial_upsell;
 mod hold_for_default;
 mod onboarding_modal;
-mod unavailable_editing_tooltip;
+
 mod usage_callout;
 
 pub use acp_onboarding_modal::*;
@@ -15,5 +15,5 @@ pub use claude_code_onboarding_modal::*;
 pub use end_trial_upsell::*;
 pub use hold_for_default::*;
 pub use onboarding_modal::*;
-pub use unavailable_editing_tooltip::*;
+
 pub use usage_callout::*;

crates/agent_ui/src/ui/unavailable_editing_tooltip.rs

@@ -1,29 +0,0 @@
-use gpui::{Context, IntoElement, Render, Window};
-use ui::{prelude::*, tooltip_container};
-
-pub struct UnavailableEditingTooltip {
-    agent_name: SharedString,
-}
-
-impl UnavailableEditingTooltip {
-    pub fn new(agent_name: SharedString) -> Self {
-        Self { agent_name }
-    }
-}
-
-impl Render for UnavailableEditingTooltip {
-    fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
-        tooltip_container(cx, |this, _| {
-            this.child(Label::new("Unavailable Editing")).child(
-                div().max_w_64().child(
-                    Label::new(format!(
-                        "Editing previous messages is not available for {} yet.",
-                        self.agent_name
-                    ))
-                    .size(LabelSize::Small)
-                    .color(Color::Muted),
-                ),
-            )
-        })
-    }
-}