fix(tui): avoided OSC 11 polling on Windows Subsystem for Linux

- Added WSL detection in terminal initialization and skipped periodic OSC 11 polling when running under Windows Subsystem for Linux.
- Removed mode 2031 activity tracking and stopped OSC 11 polling immediately when DA1/Mode 2031 reports were received.
- Extended OSC 11 appearance tests to restore platform/env state and verify no polling is started under WSL.

Fixes #914

Author: can1357

packages/coding-agent/CHANGELOG.md

@@ -1,8 +1,14 @@
 # Changelog
 
 ## [Unreleased]
+### Added
+
+- Added `statusLine.sessionAccent` to disable session-name accent coloring for the editor border and status line gap ([#918](https://github.com/can1357/oh-my-pi/issues/918))
+
 ### Fixed
 
+- Disabled repeated OSC 11 background-color polling under WSL to avoid Windows terminal tab crashes while keeping initial and event-driven appearance detection ([#914](https://github.com/can1357/oh-my-pi/issues/914))
+
 - Fixed SSH ControlMaster socket paths to use OpenSSH's connection hash (`%C`) so connections to the same host with different users, ports, or jump hosts do not share a master session.
 
 

packages/coding-agent/src/modes/interactive-mode.ts

@@ -644,7 +644,9 @@ export class InteractiveMode implements InteractiveModeContext {
 		} else if (this.isPythonMode) {
 			this.editor.borderColor = theme.getPythonModeBorderColor();
 		} else {
-			const sessionName = settings.get("statusLine.sessionAccent") ? this.sessionManager.getSessionName() : undefined;
+			const sessionName = settings.get("statusLine.sessionAccent")
+				? this.sessionManager.getSessionName()
+				: undefined;
 			const hex = sessionName ? getSessionAccentHex(sessionName) : undefined;
 			const ansi = getSessionAccentAnsi(hex);
 			if (ansi) {

packages/tui/src/terminal.ts

@@ -96,6 +96,10 @@ export interface Terminal {
 	get appearance(): TerminalAppearance | undefined;
 }
 
+function isWindowsSubsystemForLinux(): boolean {
+	return process.platform === "linux" && (!!$env.WSL_DISTRO_NAME || !!$env.WSL_INTEROP);
+}
+
 /**
  * Real terminal using process.stdin/stdout
  */
@@ -105,7 +109,7 @@ export class ProcessTerminal implements Terminal {
 	#resizeHandler?: () => void;
 	#kittyProtocolActive = false;
 	#modifyOtherKeysActive = false;
-	#modifyOtherKeysTimeout?: ReturnType<typeof setTimeout>;
+	#modifyOtherKeysTimeout?: Timer;
 	#stdinBuffer?: StdinBuffer;
 	#stdinDataHandler?: (data: string) => void;
 	#dead = false;
@@ -118,7 +122,6 @@ export class ProcessTerminal implements Terminal {
 	#osc11ResponseBuffer = "";
 	#pendingDa1Sentinels = 0;
 	#osc11PollTimer?: Timer;
-	#mode2031Active = false;
 	#mode2031DebounceTimer?: Timer;
 
 	get kittyProtocolActive(): boolean {
@@ -185,7 +188,12 @@ export class ProcessTerminal implements Terminal {
 
 		// Start periodic OSC 11 re-query for terminals without Mode 2031
 		// (Warp, Alacritty, WezTerm, iTerm2). Self-disables once Mode 2031 fires.
-		this.#startOsc11Poll();
+		// Windows Terminal under WSL has been observed to close the hosting tab
+		// after repeated OSC 11/DA1 probes. Keep the initial/event-driven probes,
+		// but avoid background polling there.
+		if (!isWindowsSubsystemForLinux()) {
+			this.#startOsc11Poll();
+		}
 	}
 
 	/**
@@ -328,10 +336,7 @@ export class ProcessTerminal implements Terminal {
 			// (Neovim convention — coalesces rapid notifications during transitions)
 			const appearanceMatch = sequence.match(appearanceDsrPattern);
 			if (appearanceMatch) {
-				if (!this.#mode2031Active) {
-					this.#mode2031Active = true;
-					this.#stopOsc11Poll();
-				}
+				this.#stopOsc11Poll();
 				if (this.#mode2031DebounceTimer) clearTimeout(this.#mode2031DebounceTimer);
 				this.#mode2031DebounceTimer = setTimeout(() => {
 					this.#mode2031DebounceTimer = undefined;
@@ -515,7 +520,6 @@ export class ProcessTerminal implements Terminal {
 		this.#osc11QueryQueued = false;
 		this.#osc11ResponseBuffer = "";
 		this.#pendingDa1Sentinels = 0;
-		this.#mode2031Active = false;
 
 		// Disable Kitty keyboard protocol if not already done by drainInput()
 		if (this.#kittyProtocolActive) {

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

@@ -3,6 +3,7 @@ import { ProcessTerminal } from "@oh-my-pi/pi-tui/terminal";
 
 const stdinIsTtyDescriptor = Object.getOwnPropertyDescriptor(process.stdin, "isTTY");
 const stdoutIsTtyDescriptor = Object.getOwnPropertyDescriptor(process.stdout, "isTTY");
+const processPlatformDescriptor = Object.getOwnPropertyDescriptor(process, "platform");
 const stdinSetRawModeDescriptor = Object.getOwnPropertyDescriptor(process.stdin, "setRawMode");
 
 function restoreProperty(target: object, key: string, descriptor: PropertyDescriptor | undefined): void {
@@ -26,6 +27,9 @@ describe("ProcessTerminal OSC 11 appearance detection", () => {
 		restoreProperty(process.stdin, "isTTY", stdinIsTtyDescriptor);
 		restoreProperty(process.stdout, "isTTY", stdoutIsTtyDescriptor);
 		restoreProperty(process.stdin, "setRawMode", stdinSetRawModeDescriptor);
+		restoreProperty(process, "platform", processPlatformDescriptor);
+		delete Bun.env.WSL_INTEROP;
+		delete Bun.env.WSL_DISTRO_NAME;
 	});
 
 	function setupTerminal() {
@@ -152,7 +156,7 @@ describe("ProcessTerminal OSC 11 appearance detection", () => {
 		terminal.stop();
 	});
 
-	it("poll timer self-disables when Mode 2031 fires", () => {
+	it("poll timer self-disables when Mode 2031 fires outside WSL", () => {
 		vi.useFakeTimers();
 		const { terminal, queryCount } = setupTerminal();
 
@@ -186,6 +190,23 @@ describe("ProcessTerminal OSC 11 appearance detection", () => {
 		terminal.stop();
 	});
 
+	it("does not start the OSC 11 poll timer under WSL", () => {
+		vi.useFakeTimers();
+		Object.defineProperty(process, "platform", { value: "linux", configurable: true });
+		Bun.env.WSL_INTEROP = "/run/WSL/1_interop";
+		const { terminal, queryCount } = setupTerminal();
+
+		process.stdin.emit("data", "\x1b]11;rgb:ffff/ffff/ffff\x07");
+		process.stdin.emit("data", "\x1b[?1;2c");
+		const afterInitial = queryCount();
+
+		vi.advanceTimersByTime(4000);
+
+		expect(queryCount()).toBe(afterInitial);
+
+		terminal.stop();
+	});
+
 	it("partial OSC 11 buffer does not swallow unrelated input", () => {
 		vi.useFakeTimers();
 		const { terminal, received } = setupTerminal();