fix layout margins

src/w/horizontal_layout.cpp

@@ -29,9 +29,9 @@ void widget::HorizontalLayout::_update_layout(const SDL_Rect& vp) noexcept
     {
          _widgets.at(i)->viewport({
             vp.x + margins.w + (int)i * (widget_size + margins.w),
-            vp.y + margins.h,
-            widget_size - margins.w,
-            vp.h - margins.h
+            vp.y,
+            widget_size,
+            vp.h
         });
     }
 }

src/w/vertical_layout.cpp

@@ -28,10 +28,10 @@ void widget::VerticalLayout::_update_layout(const SDL_Rect& vp) noexcept
     for (std::vector<Widget*>::size_type i = 0; i < _widgets.size(); i++)
     {
         SDL_Rect widget_vp = {
-                vp.x + margins.w,
-                vp.y + margins.h + (int)i * (widget_size + margins.h),
-                vp.w - margins.w,
-                widget_size - margins.h,
+                vp.x,
+                vp.y + ((int)i + 1) * margins.h + (int)i * widget_size,
+                vp.w,
+                widget_size,
         };
         _widgets.at(i)->viewport(widget_vp);
     }