made features a frozenset

src/textual/app.py

@@ -14,6 +14,7 @@ from time import perf_counter
 from typing import (
     TYPE_CHECKING,
     Any,
+    cast,
     Generic,
     Iterable,
     Iterator,
@@ -163,7 +164,7 @@ class App(Generic[ReturnType], DOMNode):
         _init_uvloop()
 
         super().__init__()
-        self.features: set[FeatureFlag] = parse_features(os.getenv("TEXTUAL", ""))
+        self.features: frozenset[FeatureFlag] = parse_features(os.getenv("TEXTUAL", ""))
 
         self.console = Console(
             file=(open(os.devnull, "wt") if self.is_headless else sys.__stdout__),
@@ -555,7 +556,9 @@ class App(Generic[ReturnType], DOMNode):
         """
 
         if headless:
-            self.features.add("headless")
+            self.features = cast(
+                frozenset[FeatureFlag], self.features.union({"headless"})
+            )
 
         async def run_app() -> None:
             if quit_after is not None:

src/textual/drivers/windows_driver.py

@@ -1,4 +1,4 @@
-from __future__ import annotations
+    from __future__ import annotations
 
 import asyncio
 import sys
@@ -44,6 +44,14 @@ class WindowsDriver(Driver):
         write("\x1b[?1006l")
         self.console.file.flush()
 
+    def _enable_bracketed_paste(self) -> None:
+        """Enable bracketed paste mode."""
+        self.console.file.write("\x1b[?2004h")
+
+    def _disable_bracketed_paste(self) -> None:
+        """Disable bracketed pasgte mode."""
+        self.console.file.write("\x1b[?2004l")
+
     def start_application_mode(self) -> None:
 
         loop = asyncio.get_running_loop()
@@ -54,6 +62,7 @@ class WindowsDriver(Driver):
         self._enable_mouse_support()
         self.console.show_cursor(False)
         self.console.file.write("\033[?1003h\n")
+        self._enable_bracketed_paste()
 
         app = active_app.get()
 
@@ -75,6 +84,7 @@ class WindowsDriver(Driver):
             pass
 
     def stop_application_mode(self) -> None:
+        self._disable_bracketed_paste()
         self.disable_input()
         if self._restore_console:
             self._restore_console()

src/textual/features.py

@@ -14,7 +14,7 @@ FEATURES: Final = {"devtools", "debug", "headless"}
 FeatureFlag = Literal["devtools", "debug", "headless"]
 
 
-def parse_features(features: str) -> set[FeatureFlag]:
+def parse_features(features: str) -> frozenset[FeatureFlag]:
     """Parse features env var
 
     Args:
@@ -24,8 +24,8 @@ def parse_features(features: str) -> set[FeatureFlag]:
         frozenset[FeatureFlag]: A frozen set of known features.
     """
 
-    features_set = set(
+    features_set = frozenset(
         feature.strip().lower() for feature in features.split(",") if feature.strip()
     ).intersection(FEATURES)
 
-    return cast("set[FeatureFlag]", features_set)
+    return cast("frozenset[FeatureFlag]", features_set)