PRInt32 StyleFontImpl::CalcDifference(const StyleFontImpl& aOther) const
PRInt32 StyleSpacingImpl::CalcDifference(const StyleSpacingImpl& aOther) const
PRInt32 StyleFontImpl::CalcDifference(const StyleFontImpl& aOther) const{  if (mFont.Equals(aOther.mFont) && mFixedFont.Equals(aOther.mFixedFont) &&      (mFlags == aOther.mFlags)) {    return NS_STYLE_HINT_NONE;  }  return NS_STYLE_HINT_REFLOW;}