agent: Add setting to control edit card expanded state (#34040)

This PR adds the `expand_edit_card` setting, which controls whether edit
cards in the agent panel are expanded, thus showing or not the full diff
of a given file's AI-driven change. I personally prefer to have these
cards collapsed by default as I am mostly reviewing diffs using either
the review multibuffer or the diffs within the file's buffer itself.
Didn't want to change the default behavior as that was intentionally
chosen, so here we are! :)

Open to feedback about the setting name; I've iterated between a few
options and don't necessarily feel like the current one is the best.

Release Notes:

- agent: Added a setting to control whether edit cards are expanded in
the agent panel, thus showing or hiding the full diff of a file's
changes.

crates/assistant_tools/src/edit_file_tool.rs

@@ -4,6 +4,7 @@ use crate::{
     schema::json_schema_for,
     ui::{COLLAPSED_LINES, ToolOutputPreview},
 };
+use agent_settings;
 use anyhow::{Context as _, Result, anyhow};
 use assistant_tool::{
     ActionLog, AnyToolCard, Tool, ToolCard, ToolResult, ToolResultContent, ToolResultOutput,
@@ -14,7 +15,7 @@ use editor::{Editor, EditorMode, MinimapVisibility, MultiBuffer, PathKey};
 use futures::StreamExt;
 use gpui::{
     Animation, AnimationExt, AnyWindowHandle, App, AppContext, AsyncApp, Entity, Task,
-    TextStyleRefinement, WeakEntity, pulsating_between, px,
+    TextStyleRefinement, Transformation, WeakEntity, percentage, pulsating_between, px,
 };
 use indoc::formatdoc;
 use language::{
@@ -515,7 +516,9 @@ pub struct EditFileToolCard {
 
 impl EditFileToolCard {
     pub fn new(path: PathBuf, project: Entity<Project>, window: &mut Window, cx: &mut App) -> Self {
+        let expand_edit_card = agent_settings::AgentSettings::get_global(cx).expand_edit_card;
         let multibuffer = cx.new(|_| MultiBuffer::without_headers(Capability::ReadOnly));
+
         let editor = cx.new(|cx| {
             let mut editor = Editor::new(
                 EditorMode::Full {
@@ -556,7 +559,7 @@ impl EditFileToolCard {
             diff_task: None,
             preview_expanded: true,
             error_expanded: None,
-            full_height_expanded: true,
+            full_height_expanded: expand_edit_card,
             total_lines: None,
         }
     }
@@ -755,6 +758,13 @@ impl ToolCard for EditFileToolCard {
             _ => None,
         };
 
+        let running_or_pending = match status {
+            ToolUseStatus::Running | ToolUseStatus::Pending => Some(()),
+            _ => None,
+        };
+
+        let should_show_loading = running_or_pending.is_some() && !self.full_height_expanded;
+
         let path_label_button = h_flex()
             .id(("edit-tool-path-label-button", self.editor.entity_id()))
             .w_full()
@@ -863,6 +873,18 @@ impl ToolCard for EditFileToolCard {
                 header.bg(codeblock_header_bg)
             })
             .child(path_label_button)
+            .when(should_show_loading, |header| {
+                header.pr_1p5().child(
+                    Icon::new(IconName::ArrowCircle)
+                        .size(IconSize::XSmall)
+                        .color(Color::Info)
+                        .with_animation(
+                            "arrow-circle",
+                            Animation::new(Duration::from_secs(2)).repeat(),
+                            |icon, delta| icon.transform(Transformation::rotate(percentage(delta))),
+                        ),
+                )
+            })
             .when_some(error_message, |header, error_message| {
                 header.child(
                     h_flex()