private static int getChildNumber(@NotNull PsiElement parent, @NotNull PsiElement child) {
    if (!Registry.is("similarity.find.usages.use.parent.features.with.child.number")) return -1;
    PsiElement[] children = Arrays.stream(parent.getChildren()).filter(e -> !(e instanceof PsiWhiteSpace)).toArray(PsiElement[]::new);
    for (int i = 0; i < children.length; i++) {
      if (children[i] == child) {
        return i;
      }
    }
    return -1;
  }
private static int getChildNumber(@NotNull PsiElement parent, @NotNull PsiElement child)