tree/container: introduce `container_toplevel_ancestor` helper

This allows us to not have to explicitly write the same while loop
everywhere.

1 files changed, 2 insertions, 8 deletions

diff --git a/sway/input/seatop_default.c b/sway/input/seatop_default.c
index 2bce2f77..b8265441 100644
--- a/sway/input/seatop_default.c
+++ b/sway/input/seatop_default.c
@@ -338,10 +338,7 @@ static void handle_button(struct sway_seat *seat, uint32_t time_msec,
                 if (button == btn_move && (mod_pressed || on_titlebar)) {
                         seat_set_focus_container(seat,
                                         seat_get_focus_inactive_view(seat, &cont->node));
-                        while (cont->parent) {
-                                cont = cont->parent;
-                        }
-                        seatop_begin_move_floating(seat, cont);
+                        seatop_begin_move_floating(seat, container_toplevel_ancestor(cont));
                         return;
                 }
         }
@@ -359,10 +356,7 @@ static void handle_button(struct sway_seat *seat, uint32_t time_msec,
                 uint32_t btn_resize = config->floating_mod_inverse ?
                         BTN_LEFT : BTN_RIGHT;
                 if (mod_pressed && button == btn_resize) {
-                        struct sway_container *floater = cont;
-                        while (floater->parent) {
-                                floater = floater->parent;
-                        }
+                        struct sway_container *floater = container_toplevel_ancestor(cont);
                         edge = 0;
                         edge |= cursor->cursor->x > floater->x + floater->width / 2 ?
                                 WLR_EDGE_RIGHT : WLR_EDGE_LEFT;