private @Nullable PsiElement handleElement(PsiElement element, @Nullable String newElementName) {
            if (element instanceof PsiField) {
              PsiClass containingClass = ((PsiField)element).getContainingClass();
              if (containingClass != null) {
                String classQualifiedName = containingClass.getQualifiedName();
                if (classQualifiedName != null) {
                  if (newElementName == null) {
                    newElementName = ((PsiField)element).getName();
                  }
                  if (classQualifiedName.startsWith(COM_INTELLIJ_ICONS_PREFIX)) {
                    return replace(newElementName, classQualifiedName, COM_INTELLIJ_ICONS_PREFIX);
                  }
                  if (classQualifiedName.startsWith(ICONS_PACKAGE_PREFIX)) {
                    return replace(newElementName, classQualifiedName, ICONS_PACKAGE_PREFIX);
                  }
                  return ElementManipulators.handleContentChange(myElement, classQualifiedName + "." + newElementName);
                }
              }
            }
            return null;
          }
private @Nullable PsiElement handleElement(PsiElement element, @Nullable String newElementName)