it discrupts cscope

srcexpl makes cscope can't work properly
After I toggle on srcexpl,    cscope command can't work correctly
eg.  it displays all keyword refences files name, but all files are displayed as empty.
eg.  when I search for the keyword definition, it said the file "xxxx.c" does not exist, but it is just there.

the fix is to quit and re-enter the file, but this whole thing is so annoying.