Add the commandline to the OSC 133 command start

Given

	$ cat ~/.config/kitty/kitty.conf
	notify_on_cmd_finish unfocused 0.1 command notify-send "job finished with status: %s" %c

kitty will send a notification whenever a long-running (>.1s) foreground
command finishes while kitty is not focused.

The %c placeholder will be replaced by the commandline.

This is passed via the OSC 133 command start marker, kitty's fish shell
integration.

That integration has been disabled for fish 4.0.0 because it's no longer
necessary since fish already prints OSC 133. But we missed the parameter for
the command string. Fix it.  (It's debatable whether the shell or the terminal
should provide this feature but I think we should fix this regression?)

Closes #11203

See https://github.com/kovidgoyal/kitty/issues/8385#issuecomment-2692659161

(cherry picked from commit 4378e73fc7)

src/reader.rs

@@ -89,6 +89,7 @@
 use crate::operation_context::{get_bg_context, OperationContext};
 use crate::output::parse_color;
 use crate::output::parse_color_maybe_none;
+use crate::output::BufferedOuputter;
 use crate::output::Outputter;
 use crate::pager::{PageRendering, Pager, SelectionMotion};
 use crate::panic::AT_EXIT;
@@ -658,8 +659,13 @@ fn read_i(parser: &Parser) -> i32 {
         data.command_line.clear();
         data.update_buff_pos(EditableLineTag::Commandline, None);
         data.command_line_changed(EditableLineTag::Commandline);
-        // OSC 133 End of command
-        data.screen.write_bytes(b"\x1b]133;C\x07");
+        // OSC 133 "Command start"
+        write!(
+            BufferedOuputter::new(&mut Outputter::stdoutput().borrow_mut()),
+            "\x1b]133;C;cmdline_url={}\x07",
+            escape_string(&command, EscapeStringStyle::Url),
+        )
+        .unwrap();
         event::fire_generic(parser, L!("fish_preexec").to_owned(), vec![command.clone()]);
         let eval_res = reader_run_command(parser, &command);
         signal_clear_cancel();