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
* @param flags flags controlling additional parameters. Valid flags are
	 * <code>UPDATE_REFERENCES</code>, <code>UPDATE_JAVADOC_COMMENTS</code>,
	 * <code>UPDATE_REGULAR_COMMENTS</code> and
	 * <code>UPDATE_STRING_LITERALS</code>, or their bitwise OR, or
	 * <code>NONE</code>.
	 * @return the <tt>RenameSupport</tt>.
	 * @throws CoreException if an unexpected error occured while creating
	 * the <tt>RenameSupport</tt>.
	 */
	public static RenameSupport create(IType type, String newName, int flags) throws CoreException {
		RefactoringSupport.Type support= new RefactoringSupport.Type(type);
		RenameTypeRefactoring refactoring= support.getSpecificRefactoring();
		setNewName(refactoring, newName);
		refactoring.setUpdateReferences(updateReferences(flags));
		refactoring.setUpdateJavaDoc(updateJavadocComments(flags));
		refactoring.setUpdateComments(updateRegularComments(flags));
		refactoring.setUpdateStrings(updateStringLiterals(flags));
		return new RenameSupport(support, type);
	}
	
	/**
	 * Creates a new rename support for the given <tt>IMethod</tt>.
	 * 
	 * @param method the <tt>IMethod</tt> to be renamed.
	 * @param newName the method's new name. <code>null</code> is a valid value
	 * indicating that no new name is provided.
	 * @param flags flags controlling additional parameters. Valid flags are
	 * <code>UPDATE_REFERENCES</code> or <code>NONE</code>.
	 * @return the <tt>RenameSupport</tt>.
	 * @throws CoreException if an unexpected error occured while creating