fix: character truncation in raw markdown mode (#18938)

packages/cli/src/ui/components/messages/GeminiMessage.test.tsx

@@ -46,4 +46,21 @@ describe('<GeminiMessage /> - Raw Markdown Display Snapshots', () => {
       expect(lastFrame()).toMatchSnapshot();
     },
   );
+
+  it('wraps long lines correctly in raw markdown mode', () => {
+    const terminalWidth = 20;
+    const text =
+      'This is a long line that should wrap correctly without truncation';
+    const { lastFrame } = renderWithProviders(
+      <GeminiMessage
+        text={text}
+        isPending={false}
+        terminalWidth={terminalWidth}
+      />,
+      {
+        uiState: { renderMarkdown: false, streamingState: StreamingState.Idle },
+      },
+    );
+    expect(lastFrame()).toMatchSnapshot();
+  });
 });

packages/cli/src/ui/components/messages/GeminiMessage.tsx

@@ -47,7 +47,7 @@ export const GeminiMessage: React.FC<GeminiMessageProps> = ({
               ? undefined
               : Math.max(availableTerminalHeight - 1, 1)
           }
-          terminalWidth={terminalWidth}
+          terminalWidth={Math.max(terminalWidth - prefixWidth, 0)}
           renderMarkdown={renderMarkdown}
         />
         <Box

packages/cli/src/ui/components/messages/GeminiMessageContent.tsx

@@ -45,7 +45,7 @@ export const GeminiMessageContent: React.FC<GeminiMessageContentProps> = ({
             ? undefined
             : Math.max(availableTerminalHeight - 1, 1)
         }
-        terminalWidth={terminalWidth}
+        terminalWidth={Math.max(terminalWidth - prefixWidth, 0)}
         renderMarkdown={renderMarkdown}
       />
       <Box

packages/cli/src/ui/components/messages/__snapshots__/GeminiMessage.test.tsx.snap

@@ -31,3 +31,12 @@ exports[`<GeminiMessage /> - Raw Markdown Display Snapshots > renders with rende
    1 const x = 1;
 "
 `;
+
+exports[`<GeminiMessage /> - Raw Markdown Display Snapshots > wraps long lines correctly in raw markdown mode 1`] = `
+"✦  This is a long
+   line that should
+   wrap correctly
+   without
+   truncation
+"
+`;