Fix crash with large positive sprite x offset in engine preview window

src/engine_gui.cpp

@@ -97,7 +97,7 @@ struct EnginePreviewWindow : Window {
 		}
 		this->vehicle_space = std::max<int>(ScaleSpriteTrad(40), y - y_offs);
 
-		size->width = std::max(size->width, x - x_offs);
+		size->width = std::max(size->width, x + std::abs(x_offs));
 		SetDParam(0, GetEngineCategoryName(engine));
 		size->height = GetStringHeight(STR_ENGINE_PREVIEW_MESSAGE, size->width) + WidgetDimensions::scaled.vsep_wide + GetCharacterHeight(FS_NORMAL) + this->vehicle_space;
 		SetDParam(0, engine);