Extract fewer characters in getWordRangeAtCursor().

Use LOOKBACK_CHARACTER_NUM = 80 instead of the previous
EDITOR_CONTENTS_CACHE_SIZE = 1024 (which was overkill).

This speeds up many InputLogic operations.

Bug: 19987461
Change-Id: I62b6a589f87e5daab33376b3e48f1c615a66dcfb
1 file changed