[dev] [st] wide characters

[Random832]

I don't mean as in wchar_t, I mean as in characters (generally in East 
Asian languages) that are meant to take up two character cells.

I am forced to ask, though, why character cell values are stored in 
utf-8 rather than as wchar_t (or as an explicitly unicode int) in the 
first place, particularly since the simplest way to detect a wide 
character is to call the function wcwidth. What was the reason for this 
design decision? It doesn't save any space, since on most systems 
UTF_SIZ == sizeof(int) == sizeof(wchar_t).

And I don't know the st codebase well enough (or at all, really) to tell 
at a glance what would have to be changed to be able to support a 
double-width character cell, or to support wrapping to the next line if 
one is output at the second-to-last column.