[3924] Fix small bugs in fx diagram editor

Fixes various minor things that came up when updating the security plugin.

org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/editor/fx/controller/.ratings

 ContextMenuUtil.java 36184cc3f383d294463336a8318c61e98fd7d2d4 YELLOW
 EObjectDiagramController.java 9af59e8e586c8251d174108a2ce2fcdee5e75782 YELLOW
 EObjectModelChangeProvider.java f4b60cebb088a5c81ca92a41614e1a5d40030502 YELLOW
-EObjectRectangularResizableContentControllerBase.java f4a967591a60fadb20550ec3eaabccf240c9ec0d YELLOW
+EObjectRectangularResizableContentControllerBase.java 5e5331f3c16185b3d64a87c3cba43f7155f7ae2f YELLOW
 KernelServiceBasedModelChangeProviderBase.java 8d1f8ef79ecd383ff74e5a2bbcf24345aabe70af YELLOW
 LayoutModelChangeProvider.java b5449d02eaf39086909720c43e21bd061005fc9e YELLOW
 LayoutedContentAnchorageController.java 73b103c06edcbf1762654e71a3e524f43c0c50c0 YELLOW