Clang Code Model is too slow for properly correcting member access operator

1. Have a simple C++-file:

   #include <QString>
   
   int main(int argc, char *argv[])
   {
       auto str = new QString;
       st
   
       return 0;
   }
   

2. Place the cursor behind "st".
3. Type "r."
   "." is not being replaced with "->" unless you wait for more than a second after typing the "r".

str is a pointer to an object, so the "." should be replaced with the "->" operator. The needed parsing must be quicker than the developer is typing.

Found by Squish test tst_memberoperator.