Detect xterm-trimmed Password: prompt so agent doesn't hang on sudo su (#314257)

Author: Copilot

src/vs/workbench/contrib/terminalContrib/chatAgentTools/browser/tools/monitoring/outputMonitor.ts

@@ -603,9 +603,11 @@ export function detectsHighConfidenceInputPattern(cursorLine: string): boolean {
 		/:\s*\([^)]*\) +$/,
 		// Line contains (END) which is common in pagers
 		/\(END\)$/,
-		// Password prompt (must be followed by optional colon and trailing space to indicate
-		// an active prompt; otherwise normal output containing the word "password" would match).
-		/password:? +$/i,
+		// Password prompt. Requires a trailing colon (e.g. "Password:", "[sudo] password for user:")
+		// and tolerates zero or more trailing spaces — xterm's `translateToString(trimRight=true)`
+		// strips trailing whitespace from non-wrapped buffer lines, so a real `Password: ` prompt
+		// is captured from the buffer as `Password:` with no trailing space.
+		/password(?: for [^:]+)?:\s*$/i,
 		// "Press a key" or "Press any key"
 		/press a(?:ny)? key/i,
 		// Interactive prompt libraries (prompts, enquirer, inquirer) prefix the prompt with

src/vs/workbench/contrib/terminalContrib/chatAgentTools/test/browser/outputMonitor.test.ts

@@ -460,6 +460,13 @@ suite('OutputMonitor', () => {
 		});
 		test('matches password and press-any-key prompts', () => {
 			assert.strictEqual(detectsHighConfidenceInputPattern('Password: '), true);
+			// xterm's translateToString(trimRight=true) strips trailing whitespace from
+			// non-wrapped buffer lines, so a real `Password: ` prompt is captured as
+			// `Password:` with no trailing space (e.g. when running `sudo su`).
+			assert.strictEqual(detectsHighConfidenceInputPattern('Password:'), true);
+			// The colon is required: a bare line ending with the word "password" should
+			// not match (avoids false positives on log/help output that mentions the word).
+			assert.strictEqual(detectsHighConfidenceInputPattern('Enter your password'), false);
 			assert.strictEqual(detectsHighConfidenceInputPattern('Press any key to continue...'), true);
 		});
 		test('matches parenthesized defaults', () => {