Use utf8len instead of utf8decode.
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			@ -3672,7 +3672,6 @@ drawregion(int x1, int y1, int x2, int y2) {
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	Glyph base, new;
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	char buf[DRAW_BUF_SIZ];
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	bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
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	long unicodep;
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	if(!(xw.state & WIN_VISIBLE))
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		return;
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			@ -3701,7 +3700,7 @@ drawregion(int x1, int y1, int x2, int y2) {
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				base = new;
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			}
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			sl = utf8decode(new.c, &unicodep, UTF_SIZ);
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			sl = utf8len(new.c);
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			memcpy(buf+ib, new.c, sl);
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			ib += sl;
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			ic += (new.mode & ATTR_WIDE)? 2 : 1;
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