** that have all upper-case letters are within <i>..</i>.
*/
static void appendMixedFont(Blob *pOut, const char *z, int n){
  const char *zEnd = "";
  int i = 0;
  int j;
  while( i<n ){
    if( z[i]==' ' || z[j]=='=' ){
      for(j=i+1; j<n && (z[j]==' ' || z[j]=='='); j++){}
      blob_append(pOut, z+i, j-i);
      i = j;
    }else{
      for(j=i; j<n && z[j]!=' ' && z[j]!='=' && !fossil_isalpha(z[j]); j++){}
      if( j>=n || z[j]==' ' || z[j]=='=' ){
        zEnd = "";