Rename symbol should ignore preprocessor directives

int foo = 42;
#if Q_OS_WIN
foo = 0;
#elif Q_OS_LINUX
foo = 42;
#endif

Renaming foo should be applied to both references. This is true also for non-local renames.

IMHO, references inside comments should also be renamed, but I guess that would be hard to track...

Here is a good real-life example why this is necessary.