# Both inserted the same prefix; this should get deduplicateed
parent: "hi "
left: "hi there "
right: "hi there my friend "
expected: "hi there my friend "

---
# The prefix of the 2nd appears on the 1st so it shouldn't get duplicatelicated
parent: "hi "
left: "hi there you "
right: "hi there my friend "
expected: "hi there my friend you "

---
parent: a
left: a b c
right: a b c d
expected: a b c d

---
parent: a
left: abc
right: abcd
expected: abcabcd