Fix clicking a floating split container

It would focus the split container rather than the child.

This commit makes it track the child and the split container separately
and send the surface click to the child.

sway/input/cursor.c

@@ -437,18 +437,22 @@ static void dispatch_cursor_button_floating(struct sway_cursor *cursor,
 		seat_pointer_notify_button(seat, time_msec, button, state);
 		return;
 	}
+	struct sway_container *floater = cont;
+	while (floater->parent->layout != L_FLOATING) {
+		floater = floater->parent;
+	}
 
 	struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat->wlr_seat);
 	bool mod_pressed = keyboard &&
 		(wlr_keyboard_get_modifiers(keyboard) & config->floating_mod);
-	enum wlr_edges edge = find_resize_edge(cont, cursor);
+	enum wlr_edges edge = find_resize_edge(floater, cursor);
 	bool over_title = edge == WLR_EDGE_NONE && !surface;
 
 	// Check for beginning move
 	uint32_t btn_move = config->floating_mod_inverse ? BTN_RIGHT : BTN_LEFT;
 	if (button == btn_move && state == WLR_BUTTON_PRESSED &&
 			(mod_pressed || over_title)) {
-		seat_begin_move(seat, cont, button);
+		seat_begin_move(seat, floater, button);
 		return;
 	}
 
@@ -459,12 +463,12 @@ static void dispatch_cursor_button_floating(struct sway_cursor *cursor,
 	if ((resizing_via_border || resizing_via_mod) &&
 			state == WLR_BUTTON_PRESSED) {
 		if (edge == WLR_EDGE_NONE) {
-			edge |= cursor->cursor->x > cont->x + cont->width / 2 ?
+			edge |= cursor->cursor->x > floater->x + floater->width / 2 ?
 				WLR_EDGE_RIGHT : WLR_EDGE_LEFT;
-			edge |= cursor->cursor->y > cont->y + cont->height / 2 ?
+			edge |= cursor->cursor->y > floater->y + floater->height / 2 ?
 				WLR_EDGE_BOTTOM : WLR_EDGE_TOP;
 		}
-		seat_begin_resize(seat, cont, button, edge);
+		seat_begin_resize(seat, floater, button, edge);
 		return;
 	}
 
@@ -599,9 +603,6 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 		}
 		seat_pointer_notify_button(cursor->seat, time_msec, button, state);
 	} else if (cont && container_is_floating_or_child(cont)) {
-		while (cont->parent->layout != L_FLOATING) {
-			cont = cont->parent;
-		}
 		dispatch_cursor_button_floating(cursor, time_msec, button, state,
 				surface, sx, sy, cont);
 	} else if (surface && cont && cont->type != C_VIEW) {