code: public int getSpanFlags(Object what) {
          int count = mSpanCount;
          Object[] spans = mSpans;
  
          for (int i = count - 1; i >= 0; i--) {
              if (spans[i] == what) {
                  return mSpanFlags[i];
              }
          }
  
          return 0;
      }
docs: Return the flags of the end of the specified
  markup object, or 0 if it is not attached to this buffer.