Change to opposite case of all letters in string

[Gintaras]

Code:

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str s.getsel
if(!s.len) ret
int i is
for i 0 s.len
,if(isalpha(s[i]))
,,is=1
,,if(isupper(s[i])) s[i]=tolower(s[i])
,,else s[i]=toupper(s[i])
if(is) s.setsel

;testTEST 555