This function can call `syntax-ppss' on any position before END, but it
should not call `syntax-ppss-flush-cache', which means that it should not
call `syntax-ppss' on some position and later modify the buffer on some
This function can call `syntax-ppss' on any position before END, but it
should not call `syntax-ppss-flush-cache', which means that it should not
call `syntax-ppss' on some position and later modify the buffer on some