[426] Specific behavior for free form compartment

This compartment is an intermediate GMF Node and should not have the
same behavior when computing auto-size:
- Minimal size defined by ResizableCompartmentFigure.MIN_CLIENT_DP
- No shadow border

Bug: #426

plugins/org.eclipse.sirius.diagram.ui/src-diag/org/eclipse/sirius/diagram/ui/internal/refresh/GMFHelper.java

@@ -39,6 +39,7 @@
 import org.eclipse.gef.ConnectionEditPart;
 import org.eclipse.gef.EditPart;
 import org.eclipse.gef.GraphicalEditPart;
+import org.eclipse.gmf.runtime.diagram.ui.figures.ResizableCompartmentFigure;
 import org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor;
 import org.eclipse.gmf.runtime.gef.ui.figures.NodeFigure;
 import org.eclipse.gmf.runtime.notation.Bounds;
@@ -704,7 +705,7 @@ public static double getShadowBorderSize(Node node) {
     public static boolean isShadowBorderNeeded(Node node) {
         boolean needShadowBorder = false;
         EObject element = node.getElement();
-        if (element instanceof DDiagramElementContainer) {
+        if (!new ViewQuery(node).isFreeFormCompartment() && element instanceof DDiagramElementContainer) {
             DDiagramElementContainer ddec = (DDiagramElementContainer) element;
             needShadowBorder = !(new DDiagramElementContainerExperimentalQuery(ddec).isRegion() || ddec.getOwnedStyle() instanceof WorkspaceImage);
         }
@@ -733,7 +734,9 @@ private static void replaceAutoSize(Node node, Rectangle bounds, boolean useFigu
                 // if there is no default size, we compute it from the given
                 // node.
                 EObject element = node.getElement();
-                if (element instanceof AbstractDNode) {
+                if (new ViewQuery(node).isFreeFormCompartment()) {
+                    defaultSize = new Dimension(ResizableCompartmentFigure.MIN_CLIENT_DP, ResizableCompartmentFigure.MIN_CLIENT_DP);
+                } else if (element instanceof AbstractDNode) {
                     defaultSize = getDefaultSize((AbstractDNode) element);
                 }
             }