Bug 29698 drag and drop of java files between packages in package explorer doesn't work
the <preview> <ok> <cancel> dialog shows up, but <ok> has the same effect as <cancel> and <preview> would only show movements of files and no changes in imports of other java files. on <ok> in the preview it only moves the file(s) (as indicated ) without changing referencing imports.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/refactoring/RenameSupport.java
refactoring.setUpdateReferences(updateReferences(flags));
		refactoring.setUpdateJavaDoc(updateJavadocComments(flags));
		refactoring.setUpdateComments(updateRegularComments(flags));
		refactoring.setUpdateStrings(updateStringLiterals(flags));
		refactoring.setRenameGetter(updateGetterMethod(flags));
		refactoring.setRenameSetter(updateSetterMethod(flags));
		return new RenameSupport(support, field);
	}
	
	/**
	 * Creates a new <tt>RenameSupport</tt> for the given <tt>IJavaElement</tt>
	 * by forwarding the creation to one of the concrete create methods
	 * depending on the type of the given <tt>IJavaElement</tt>.
	 * @param element the <tt>IJavaElement</tt> to be renamed
	 * @param newName the Java element's new name. <code>null</code> is a valid
	 * value indicating that no new name is provided.
	 * @param flags flags controlling additional parameters. For a list of valid
	 * flags see the corresponding create methods of this class.
	 * @return the <tt>RenameSupport</tt>.
	 * @throws CoreException if an unexpected error occured while creating
	 * the <tt>RenameSupport</tt>.
	 * 
	 * @see #create(IJavaProject, int)
	 * @see #create(IPackageFragmentRoot)
	 * @see #create(IPackageFragment, int)
	 * @see #create(ICompilationUnit, int)
	 * @see #create(IType, int)
	 * @see #create(IMethod, int)
	 * @see #create(IField, int)
	 */