Revert "Bug 581248 - CellVisualUpdateEvent incorrect for header regions when scrolled"

This reverts commit 92613cd8eb2cdb9df18c02aa1e7ead3a2aeeb79c.
diff --git a/org.eclipse.nebula.widgets.nattable.core/src/org/eclipse/nebula/widgets/nattable/layer/event/CellVisualUpdateEvent.java b/org.eclipse.nebula.widgets.nattable.core/src/org/eclipse/nebula/widgets/nattable/layer/event/CellVisualUpdateEvent.java
index 255bcb3..e078f4f 100644
--- a/org.eclipse.nebula.widgets.nattable.core/src/org/eclipse/nebula/widgets/nattable/layer/event/CellVisualUpdateEvent.java
+++ b/org.eclipse.nebula.widgets.nattable.core/src/org/eclipse/nebula/widgets/nattable/layer/event/CellVisualUpdateEvent.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2013, 2022 Dirk Fauth and others.
+ * Copyright (c) 2013, 2020 Dirk Fauth and others.
  *
  * This program and the accompanying materials are made
  * available under the terms of the Eclipse Public License 2.0
@@ -15,7 +15,6 @@
 import org.eclipse.nebula.widgets.nattable.grid.layer.DimensionallyDependentLayer;
 import org.eclipse.nebula.widgets.nattable.layer.ILayer;
 import org.eclipse.nebula.widgets.nattable.layer.cell.ILayerCell;
-import org.eclipse.nebula.widgets.nattable.viewport.ViewportLayer;
 
 /**
  * Specialization of the CellVisualChangeEvent. The only difference is the
@@ -67,17 +66,6 @@ public boolean convertToLocal(ILayer localLayer) {
         if (!(localLayer instanceof DimensionallyDependentLayer)) {
             columnPos = localLayer.underlyingToLocalColumnPosition(getLayer(), this.columnPosition);
             rowPos = localLayer.underlyingToLocalRowPosition(getLayer(), this.rowPosition);
-        } else {
-            DimensionallyDependentLayer ddl = (DimensionallyDependentLayer) localLayer;
-
-            if (ddl.getHorizontalLayerDependency() instanceof ViewportLayer) {
-                int columnIndex = this.layer.getColumnIndexByPosition(this.columnPosition);
-                columnPos = ((ViewportLayer) ddl.getHorizontalLayerDependency()).getColumnPositionByIndex(columnIndex);
-            }
-            if (ddl.getVerticalLayerDependency() instanceof ViewportLayer) {
-                int rowIndex = this.layer.getRowIndexByPosition(this.rowPosition);
-                rowPos = ((ViewportLayer) ddl.getVerticalLayerDependency()).getRowPositionByIndex(rowIndex);
-            }
         }
 
         if (columnPos < 0 || rowPos < 0) {