test(tui): cover pending tmux appearance teardown

packages/tui/test/terminal-appearance.test.ts

@@ -410,6 +410,26 @@ describe("ProcessTerminal OSC 11 appearance detection", () => {
 		expect(received).toEqual([]);
 	});
 
+	it("cancels a pending tmux appearance cache read during teardown", () => {
+		vi.useFakeTimers();
+		Bun.env.TMUX = "/tmp/tmux-1000/default,1234,0";
+		const { terminal, queryCount, sentinelCount } = setupTerminal();
+
+		process.stdin.emit("data", "\x1b]11;rgb:0000/0000/0000\x07");
+		for (let i = 0; i < 7; i++) process.stdin.emit("data", "\x1b[?1;2c");
+		const directQueriesBeforeRefresh = queryCount();
+		const directSentinelsBeforeRefresh = sentinelCount();
+
+		terminal.refreshAppearance?.();
+		expect(vi.getTimerCount()).toBe(1);
+		terminal.stop();
+		expect(vi.getTimerCount()).toBe(0);
+		vi.advanceTimersByTime(100);
+
+		expect(queryCount()).toBe(directQueriesBeforeRefresh);
+		expect(sentinelCount()).toBe(directSentinelsBeforeRefresh);
+	});
+
 	it("refreshAppearance() re-evaluates a changed background through the callback pipeline", () => {
 		const { terminal } = setupTerminal();
 		const appearances: string[] = [];