Store creation spec on windows

Will come in handy when serializing them

kitty/launch.py

@@ -779,6 +779,8 @@ def _launch(
                 env=env or None, watchers=watchers or None, is_clone_launch=is_clone_launch, next_to=next_to, **kw)
             if child_death_callback is not None:
                 boss.monitor_pid(new_window.child.pid or 0, child_death_callback)
+            if new_window.creation_spec and opts.watcher:
+                new_window.creation_spec = new_window.creation_spec._replace(watchers=tuple(opts.watcher))
         if spacing:
             patch_window_edges(new_window, spacing)
             tab.relayout()

kitty/tabs.py

@@ -55,7 +55,7 @@ from .tab_bar import TabBar, TabBarData
 from .types import ac
 from .typing_compat import EdgeLiteral, SessionTab, SessionType, TypedDict
 from .utils import cmdline_for_hold, log_error, platform_window_id, resolved_shell, shlex_split, which
-from .window import CwdRequest, Watchers, Window, WindowDict, global_watchers
+from .window import CwdRequest, Watchers, Window, WindowCreationSpec, WindowDict, global_watchers
 from .window_list import WindowList
 
 
@@ -584,6 +584,15 @@ class Tab:  # {{{
         next_to: Window | None = None,
         hold_after_ssh: bool = False
     ) -> Window:
+        cs = WindowCreationSpec(
+            use_shell=use_shell, cmd=cmd, has_stdin=bool(stdin), override_title=override_title, cwd_from=cwd_from,
+            cwd=cwd, overlay_for=overlay_for, env=None if env is None else tuple(env.items()), location=location,
+            copy_colors_from=None if copy_colors_from is None else copy_colors_from.id,
+            allow_remote_control=allow_remote_control,
+            remote_control_passwords=None if remote_control_passwords is None else remote_control_passwords.copy(),
+            marker=marker, overlay_behind=overlay_behind, is_clone_launch=is_clone_launch, hold=hold, bias=bias,
+            hold_after_ssh=hold_after_ssh,
+        )
         child = self.launch_child(
             use_shell=use_shell, cmd=cmd, stdin=stdin, cwd_from=cwd_from, cwd=cwd, env=env,
             is_clone_launch=is_clone_launch, add_listen_on_env_var=False if allow_remote_control and remote_control_passwords else True,
@@ -594,6 +603,7 @@ class Tab:  # {{{
             copy_colors_from=copy_colors_from, watchers=watchers,
             allow_remote_control=allow_remote_control, remote_control_passwords=remote_control_passwords
         )
+        window.creation_spec = cs
         # Must add child before laying out so that resize_pty succeeds
         get_boss().add_child(window)
         self._add_window(window, location=location, overlay_for=overlay_for, overlay_behind=overlay_behind, bias=bias, next_to=next_to)

kitty/window.py

@@ -358,6 +358,30 @@ def call_watchers(windowref: Callable[[], Optional['Window']], which: str, data:
     add_timer(callback, 0, False)
 
 
+class WindowCreationSpec(NamedTuple):
+    use_shell: bool = True
+    cmd: list[str] | None = None
+    has_stdin: bool = False
+    override_title: str | None = None
+    cwd_from: CwdRequest | None = None
+    cwd: str | None = None
+    overlay_for: int | None = None
+    env: tuple[tuple[str, str], ...] | None = None
+    location: str | None = None
+    copy_colors_from: int | None = None
+    allow_remote_control: bool = False
+    marker: str | None = None
+    watchers: tuple[str, ...] = ()
+    overlay_behind: bool = False
+    is_clone_launch: str = ''
+    remote_control_passwords: dict[str, Sequence[str]] | None = None
+    hold: bool = False
+    bias: float | None = None
+    pass_fds: tuple[int, ...] = ()
+    remote_control_fd: int = -1
+    hold_after_ssh: bool = False
+
+
 def pagerhist(screen: Screen, as_ansi: bool = False, add_wrap_markers: bool = True, upto_output_start: bool = False) -> str:
     pht = screen.historybuf.pagerhist_as_text(upto_output_start)
     if pht and (not as_ansi or not add_wrap_markers):
@@ -614,6 +638,7 @@ class Window:
     overlay_type = OverlayType.transient
     initial_ignore_focus_changes: bool = False
     initial_ignore_focus_changes_context_manager_in_operation: bool = False
+    creation_spec: WindowCreationSpec | None = None
 
     @classmethod
     @contextmanager