testing: tie test output correctly to runs, rework ui accordingly

src/vs/base/common/strings.ts

@@ -730,9 +730,12 @@ export function lcut(text: string, n: number) {
 // Escape codes, compiled from https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Functions-using-CSI-_-ordered-by-the-final-character_s_
 const CSI_SEQUENCE = /(:?\x1b\[|\x9B)[=?>!]?[\d;:]*["$#'* ]?[a-zA-Z@^`{}|~]/g;
 
+// Plus additional markers for custom `\x1b]...\x07` instructions.
+const CSI_CUSTOM_SEQUENCE = /\x1b\].*?\x07/g;
+
 export function removeAnsiEscapeCodes(str: string): string {
 	if (str) {
-		str = str.replace(CSI_SEQUENCE, '');
+		str = str.replace(CSI_SEQUENCE, '').replace(CSI_CUSTOM_SEQUENCE, '');
 	}
 
 	return str;

src/vs/base/test/common/strings.test.ts

@@ -511,6 +511,10 @@ suite('Strings', () => {
 			`${CSI}48;5;128m`, // 256 indexed color alt
 			`${CSI}38:2:0:255:255:255m`, // truecolor
 			`${CSI}38;2;255;255;255m`, // truecolor alt
+
+			// Custom sequences:
+			'\x1b]633;SetMark;\x07',
+			'\x1b]633;P;Cwd=/foo\x07',
 		];
 
 		for (const sequence of sequences) {

src/vs/workbench/contrib/testing/browser/testExplorerActions.ts

@@ -838,9 +838,31 @@ export class ShowMostRecentOutputAction extends Action2 {
 		});
 	}
 
-	public run(accessor: ServicesAccessor) {
+	public async run(accessor: ServicesAccessor) {
+		const quickInputService = accessor.get(IQuickInputService);
+		const terminalOutputService = accessor.get(ITestingOutputTerminalService);
 		const result = accessor.get(ITestResultService).results[0];
-		accessor.get(ITestingOutputTerminalService).open(result);
+
+		if (!result.tasks.length) {
+			return;
+		}
+
+		let index = 0;
+		if (result.tasks.length > 1) {
+			const picked = await quickInputService.pick(
+				result.tasks.map((t, i) => ({ label: t.name || localize('testing.pickTaskUnnamed', "Run #{0}", i), index: i })),
+				{ placeHolder: localize('testing.pickTask', "Pick a run to show output for") }
+			);
+
+			if (!picked) {
+				return;
+			}
+
+			index = picked.index;
+		}
+
+
+		terminalOutputService.open(result, index);
 	}
 }