Removing trailing white space only for edited lines

I had added the following function in my .vimrc for removing trailing white spaces just before saving

fun! <SID>StripTrailingWhitespaces()                                            
    let l = line(".")                                                           
    let c = col(".")                                                            
    %s/\s\+$//e                                                                 
    call cursor(l, c)                                                           
endfun                                                                          

autocmd BufWritePre *.h :call <SID>StripTrailingWhitespaces()
autocmd BufWritePre *.cpp :call <SID>StripTrailingWhitespaces()
autocmd BufWritePre *.c :call <SID>StripTrailingWhitespaces()

It works really well. However, in certain cases I would like to remove trailing white spaces only from lines that I have edited. This is to ensure that my diff output looks sane as for certain legacy code files almost all lines have trailing back spaces and I do not want to burden my code reviewer with unnecessary diff.

diff -b is not a solution right now since it also ignores white spaces from anywhere in a line and sometimes that change is important enough to be include in the diff output.

So my question is - is it possible to strip trailing white spaces from only the lines that have been edited in this session in a file in vim?