lock: fix swaylock cursor remaining visible

[Luminiscental]

Fixes #8342 by listening to surface commit rather than surface map for focus and cursor rebasing on session lock.

[kennylevinsen]

Hmm, this will cause the cursor to be rebased on every single surface commit - for an animated lockscreen (e.g., hyprlock), that will be on every animated frame. That seems too aggressive.

[Nefsen402]

It just rebases the cursor which should be nearly free.

[kennylevinsen]

It just rebases the cursor which should be nearly free.

static void handle_rebase(struct sway_seat *seat, uint32_t time_msec) {
	struct seatop_default_event *e = seat->seatop_data;
	struct sway_cursor *cursor = seat->cursor;
	struct wlr_surface *surface = NULL;
	double sx = 0.0, sy = 0.0;
	e->previous_node = node_at_coords(seat,
			cursor->cursor->x, cursor->cursor->y, &surface, &sx, &sy);

	if (surface) {
		if (seat_is_input_allowed(seat, surface)) {
			wlr_seat_pointer_notify_enter(seat->wlr_seat, surface, sx, sy);
			wlr_seat_pointer_notify_motion(seat->wlr_seat, time_msec, sx, sy);
		}
	} else {
		cursor_update_image(cursor, e->previous_node);
		wlr_seat_pointer_notify_clear_focus(seat->wlr_seat);
	}
}

It sends pointer events, as it was only meant to be called when focus changes.