[dev] [st] possible bug with unicode character

[Marc Collin]

I think I found a possible bug on st when inserting a unicode character.
Here are the steps for someone to try to reproduce it.
Take the heavy round-tipped rightwards arrow (U+279C) for example.
➔
Highlight to copy and middle-click to paste into st.
Now try to immediately write something. The characters intersect and
one gets over the other. Now try to give one space after pasting ➔ and
write anything. You will see the head of the arrow gets erased. Now
try to insert 2 spaces after inserting the arrow. Now it works fine.
Really a bug or something wrong only for me?
Thanks.