don't add signal handler on Windows

src/textual/drivers/web_driver.py

@@ -14,6 +14,7 @@
 import asyncio
 import json
 import os
+import platform
 import selectors
 import signal
 import sys
@@ -28,6 +29,8 @@
 from ..geometry import Size
 from ._byte_stream import ByteStream
 
+WINDOWS = platform.system() == "Windows"
+
 
 class WebDriver(Driver):
     """A headless driver that may be run remotely."""
@@ -95,8 +98,9 @@ def do_exit() -> None:
                 self._app._post_message(messages.ExitApp()), loop=loop
             )
 
-        for _signal in (signal.SIGINT, signal.SIGTERM):
-            loop.add_signal_handler(_signal, do_exit)
+        if not WINDOWS:
+            for _signal in (signal.SIGINT, signal.SIGTERM):
+                loop.add_signal_handler(_signal, do_exit)
 
         self._write(b"__GANGLION__\n")
 
@@ -185,3 +189,7 @@ def on_meta(self, packet_type: str, payload: dict) -> None:
                 self._app._post_message(event),
                 loop=self._loop,
             )
+        elif packet_type == "quit":
+            asyncio.run_coroutine_threadsafe(
+                self._app._post_message(messages.ExitApp()), loop=self._loop
+            )