The following mistakes were present in the old code:
1) a tab or a comment after a macro identifier was not considered;
2) a space was considered mandatory after ')'.

In practice, this lead to bugs specified in the table below. The first
column is the parsed macro code. The second and third columns - the text
after "Body: " in the macro's tooltip before and at this commit
respectively.
 C++ code                   Body before     Body at
 #define m(x)x              m(x)x           x
 #define m(x)long x         ong x           long x
 #define m(x)/*A*/x         m(x)/*A*/x      /*A*/x
 #define m/*o*/long         m/*o*/long      /*o*/long
 #define m/*(x)*/ long      / long          /*(x)*/ long