Fix line wrapping in patch_stdout on Windows.

Enable autowrap before writing data to the output in `patch_stdout`. We
enable/disable VT terminal processing during every `flush()` of the Windows
Output implementation, but it turns out that this causes the autowrap flag to
be reset each time. Because of this, we have to enable autowrap each time
before writing.

src/prompt_toolkit/patch_stdout.py

@@ -203,6 +203,13 @@ def _write_and_flush(
         """
 
         def write_and_flush() -> None:
+            # Ensure that autowrap is enabled before calling `write`.
+            # XXX: On Windows, the `Windows10_Output` enables/disables VT
+            #      terminal processing for every flush. It turns out that this
+            #      causes autowrap to be reset (disabled) after each flush. So,
+            #      we have to enable it again before writing text.
+            self._output.enable_autowrap()
+
             if self.raw:
                 self._output.write_raw(text)
             else: