[Zest 2.0] Ignore node size when calculating position in grid

The location of a node describes its top-left pixel, rather than its
center. When using layout algorithms that are based on the grid layout,
this causes the offset to be half the space between the rows and columns
plus the half the width and height of the nodes.
Latter is undesirable and may cause nodes to be partially moved outside
the client area.

org.eclipse.zest.layouts/src/org/eclipse/zest/layouts/algorithms/GridLayoutAlgorithm.java

@@ -385,9 +385,8 @@ protected synchronized void applyLayoutInternal(EntityLayout[] entitiesToLayout,
  node.setSize(Math.max(childrenWidth, MIN_ENTITY_SIZE),
  Math.max(childrenHeight, MIN_ENTITY_SIZE));
  }
- DisplayIndependentDimension size = node.getSize();
- double xmove = bounds.x + j * colWidth + offsetX + size.width / 2;
- double ymove = bounds.y + i * rowHeight + offsetY + size.height / 2;
+ double xmove = bounds.x + j * colWidth + offsetX;
+ double ymove = bounds.y + i * rowHeight + offsetY;
  if (node.isMovable()) {
  node.setLocation(xmove, ymove);
  }