patch 8.1.2235: "C" with 'virtualedit' set does not include multi-byte char

Problem:    "C" with 'virtualedit' set does not include multi-byte char.
Solution:   Include the whole multi-byte char. (Nobuhiro Takasaki,
            closes #5152)
diff --git a/src/ops.c b/src/ops.c
index 6a9fbba..42b0dcb 100644
--- a/src/ops.c
+++ b/src/ops.c
@@ -912,6 +912,8 @@
 		oap->end = curwin->w_cursor;
 		curwin->w_cursor = oap->start;
 	    }
+	    if (has_mbyte)
+		mb_adjust_opend(oap);
 	}
 
 	if (oap->line_count == 1)	/* delete characters within one line */