Use the fish built-in function name to report current working directory

If the feature is enabled by fish in the future, it will override the
built-in one and there will be no duplicate reporting.

kitty_tests/shell_integration.py

@@ -171,6 +171,8 @@ def test_fish_integration(self):
             pty.send_cmd_to_child('set -q XDG_DATA_DIRS; or echo ok')
             pty.wait_till(lambda: pty.screen_contents().count(right_prompt) == 2)
             self.ae(str(pty.screen.line(1)), 'ok')
+
+            # CWD reporting
             self.assertTrue(pty.screen.last_reported_cwd.endswith(self.home_dir))
             q = os.path.join(self.home_dir, 'testing-cwd-notification-🐱')
             os.mkdir(q)

shell-integration/fish/vendor_conf.d/kitty-shell-integration.fish

@@ -97,12 +97,13 @@ function __ksi_schedule --on-event fish_prompt -d "Setup kitty integration after
 
     # Enable CWD reporting
     if not contains "no-cwd" $_ksi
-        # This is actually builtin to fish but stupidly gated on TERM
-        # https://github.com/fish-shell/fish-shell/blob/master/share/functions/__fish_config_interactive.fish#L257
-        function __ksi_report_cwd --on-variable PWD --description "Report PWD changes to the terminal"
-            status --is-command-substitution; and return
-            echo -en "\e]7;kitty-shell-cwd://$hostname$PWD\a"
+        # This function name is from fish and will override the builtin one if fish enabled this feature by default.
+        # We provide this to ensure that fish 3.2.0 and above will work.
+        # https://github.com/fish-shell/fish-shell/blob/3.2.0/share/functions/__fish_config_interactive.fish#L275
+        function __update_cwd_osc --on-variable PWD -d "Report PWD changes to kitty"
+            status is-command-substitution
+            or echo -en "\e]7;kitty-shell-cwd://$hostname$PWD\a"
         end
-        __ksi_report_cwd
+        __update_cwd_osc
     end
 end