Remove pixel cache disables in a few places

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/MaterialGraphEditWindow.cs

                     m_GraphEditorView.onConvertToSubgraphClick += ToSubGraph;
                     m_GraphEditorView.onShowInProjectClick += PingAsset;
                     this.GetRootVisualContainer().Add(graphEditorView);
-                    this.GetRootVisualContainer().parent.clippingOptions = VisualElement.ClippingOptions.ClipContents;
                 }
             }
         }

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Views/PortInputView.cs

             Add(m_EdgeControl);
 
             m_Container.visible = m_EdgeControl.visible = m_Control != null;
-
-            clippingOptions = ClippingOptions.NoClipping;
         }
 
         protected override void OnStyleResolved(ICustomStyle styles)