Fix #7742, 66dd7c3: widget position can be negative

src/widget.cpp

@@ -2494,7 +2494,7 @@ void NWidgetLeaf::Draw(const Window *w)
 
 		case WWT_RESIZEBOX:
 			assert(this->widget_data == 0);
-			DrawResizeBox(r, this->colour, this->pos_x < (uint)(w->width / 2), !!(w->flags & WF_SIZING));
+			DrawResizeBox(r, this->colour, this->pos_x < (w->width / 2), !!(w->flags & WF_SIZING));
 			break;
 
 		case WWT_CLOSEBOX:

src/widget_type.h

@@ -174,8 +174,8 @@ public:
 	uint current_x;       ///< Current horizontal size (after resizing).
 	uint current_y;       ///< Current vertical size (after resizing).
 
-	uint pos_x;           ///< Horizontal position of top-left corner of the widget in the window.
-	uint pos_y;           ///< Vertical position of top-left corner of the widget in the window.
+	int pos_x;            ///< Horizontal position of top-left corner of the widget in the window.
+	int pos_y;            ///< Vertical position of top-left corner of the widget in the window.
 
 	NWidgetBase *next;    ///< Pointer to next widget in container. Managed by parent container widget.
 	NWidgetBase *prev;    ///< Pointer to previous widget in container. Managed by parent container widget.