This CL addresses some inconsistencies found in
CursorAnchorInfo#equals.
- #mComposingText is now taken into consideration when
compared with other instances.
- NaN is now treated as if it was just a number in
CursorAnchorInfo#equals if and only if NaN is used in
-- #mInsertionMarkerHorizontal
-- #mInsertionMarkerTop
-- #mInsertionMarkerBaseline
-- #mInsertionMarkerBottom.
This is useful if we want to use NaN as a marker to
indicate that no value is specified.
Change-Id: Ibff31bc34b9d488731b294ad38240c567a06b627
eea0b8b051