caret overlaps the last character in textfield (if positioned after the last char)
r=smontagu
sr=sfraser
We think this patch can land again because the regression it introduced was fixed by
Bug #216101 which does a better job of clearing out caret fragments.
git-svn-id: svn://10.0.0.236/trunk@165192 18797224-902f-48f8-a5cc-f745e15eee43