Option for WindowHeap to not alter the layout

Bring back the DesktopGrid option to not alter window position
so that the grid look like perfect screenshots of each desktop

BUG:455350

src/effects/desktopgrid/desktopgrid_config.ui

@@ -142,6 +142,11 @@
           <string>Natural</string>
          </property>
         </item>
+        <item>
+         <property name="text">
+          <string>None</string>
+         </property>
+        </item>
        </widget>
       </item>
       <item row="2" column="0">

src/effects/private/expolayout.cpp

@@ -292,6 +292,9 @@ void ExpoLayout::updatePolish()
         case LayoutNatural:
             calculateWindowTransformationsNatural();
             break;
+        case LayoutNone:
+            resetTransformations();
+            break;
         }
     }
 
@@ -701,3 +704,13 @@ void ExpoLayout::calculateWindowTransformationsNatural()
         cell->setHeight(rect.height());
     }
 }
+
+void ExpoLayout::resetTransformations()
+{
+    for (ExpoCell *cell : std::as_const(m_cells)) {
+        cell->setX(cell->naturalX());
+        cell->setY(cell->naturalY());
+        cell->setWidth(cell->naturalWidth());
+        cell->setHeight(cell->naturalHeight());
+    }
+}

src/effects/private/expolayout.h

@@ -26,6 +26,7 @@ public:
     enum LayoutMode : uint {
         LayoutClosest = 0,
         LayoutNatural = 1,
+        LayoutNone = 2
     };
     Q_ENUM(LayoutMode)
 
@@ -65,6 +66,7 @@ Q_SIGNALS:
 private:
     void calculateWindowTransformationsClosest();
     void calculateWindowTransformationsNatural();
+    void resetTransformations();
 
     QList<ExpoCell *> m_cells;
     LayoutMode m_mode = LayoutNatural;