cursor: fix initial cursor position for new outputs

The fresh new wlr_output_cursor is positioned at (0, 0).

Call wlr_output_cursor_move() after creating the wlr_output_cursor
to fix this.

Closes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3777

types/wlr_cursor.c

@@ -265,6 +265,16 @@ static struct wlr_cursor_device *get_cursor_device(struct wlr_cursor *cur,
 	return ret;
 }
 
+static void output_cursor_move(struct wlr_cursor_output_cursor *output_cursor) {
+	struct wlr_cursor *cur = output_cursor->cursor;
+
+	double output_x = cur->x, output_y = cur->y;
+	wlr_output_layout_output_coords(cur->state->layout,
+		output_cursor->output_cursor->output, &output_x, &output_y);
+	wlr_output_cursor_move(output_cursor->output_cursor,
+		output_x, output_y);
+}
+
 static void cursor_warp_unchecked(struct wlr_cursor *cur,
 		double lx, double ly) {
 	assert(cur->state->layout);
@@ -273,17 +283,13 @@ static void cursor_warp_unchecked(struct wlr_cursor *cur,
 		return;
 	}
 
+	cur->x = lx;
+	cur->y = ly;
+
 	struct wlr_cursor_output_cursor *output_cursor;
 	wl_list_for_each(output_cursor, &cur->state->output_cursors, link) {
-		double output_x = lx, output_y = ly;
-		wlr_output_layout_output_coords(cur->state->layout,
-			output_cursor->output_cursor->output, &output_x, &output_y);
-		wlr_output_cursor_move(output_cursor->output_cursor,
-			output_x, output_y);
+		output_cursor_move(output_cursor);
 	}
-
-	cur->x = lx;
-	cur->y = ly;
 }
 
 /**
@@ -1104,6 +1110,7 @@ static void layout_add(struct wlr_cursor_state *state,
 		&output_cursor->output_commit);
 	output_cursor->output_commit.notify = output_cursor_output_handle_output_commit;
 
+	output_cursor_move(output_cursor);
 	cursor_output_cursor_update(output_cursor);
 }