Fix token count not appearing for the first message (#30035)

Release Notes:

- N/A

Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>

crates/agent/src/assistant_panel.rs

@@ -1462,6 +1462,7 @@ impl AssistantPanel {
         let thread = active_thread.thread().read(cx);
         let thread_id = thread.id().clone();
         let is_empty = active_thread.is_empty();
+        let editor_empty = self.message_editor.read(cx).is_editor_fully_empty(cx);
         let last_usage = active_thread.thread().read(cx).last_usage().or_else(|| {
             maybe!({
                 let amount = user_store.model_request_usage_amount()?;
@@ -1484,7 +1485,7 @@ impl AssistantPanel {
         let account_url = zed_urls::account_url(cx);
 
         let show_token_count = match &self.active_view {
-            ActiveView::Thread { .. } => !is_empty,
+            ActiveView::Thread { .. } => !is_empty || !editor_empty,
             ActiveView::PromptEditor { .. } => true,
             _ => false,
         };

crates/agent/src/message_editor.rs

@@ -315,6 +315,10 @@ impl MessageEditor {
         self.editor.read(cx).text(cx).trim().is_empty()
     }
 
+    pub fn is_editor_fully_empty(&self, cx: &App) -> bool {
+        self.editor.read(cx).is_empty(cx)
+    }
+
     fn send_to_model(&mut self, window: &mut Window, cx: &mut Context<Self>) {
         let Some(ConfiguredModel { model, provider }) = self
             .thread

crates/agent/src/thread.rs

@@ -267,7 +267,7 @@ impl DetailedSummaryState {
     }
 }
 
-#[derive(Default)]
+#[derive(Default, Debug)]
 pub struct TotalTokenUsage {
     pub total: usize,
     pub max: usize,