private @Nullable PsiElement handleField(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(classQualifiedName, newElementName, COM_INTELLIJ_ICONS_PREFIX);
                    }
                    if (classQualifiedName.startsWith(ICONS_PACKAGE_PREFIX)) {
                      return replace(classQualifiedName, newElementName, ICONS_PACKAGE_PREFIX);
                    }
                    return ElementManipulators.handleContentChange(myElement, classQualifiedName + "." + newElementName);
                  }
                }
              }
              return null;
            }
private @Nullable PsiElement handleField(PsiElement element, @Nullable String newElementName)