Bad width calculations if RichEditableText has no width specified with TLF 1.1

Found in 4.1.0.15204

Steps to reproduce:
1. Compile and run the attached MXML file.
2. Type the following text:
"The quick brown fox jumps over(return)
the lazy dog(return)"

Actual Results:
The RET resizes unexpectedly.
(a) By default the RET is 108px by 200px.
(b) After typing "The quick brown fox jumps over" the RET is 173px by 200px.
(c) After hitting "(return)t", the RET resizes to 108px by 200px (the same as the default value).
(d) After typing "he", the RET resizes to 173px by 200px (same as (b)).
(e) After typing " lazy dog(return)" the RET resizes to 108px by 200px (same as default value and (c)).

Expected Results:
It shouldnt constantly resize after typing a few characters or hitting return. It didnt in 4.0, so this is a new injection in Flex 4.1 or TLF 1.1.

Workaround (if any):
n/a