At the moment, EditTextShortcutSpan allows only the deletion of the text. In the future, we may decide to add extra functionality,
like "retry" where all the text is removed and a specific IME is triggered.
Fix the underline. The underline is not defined in thickness, and not as a multiplier of the default underline thickness.
Change the behaviour of SuggestionRangeSpan to match the specification.
Change-Id: I80437d9887c7a2ff8f62c38afbb0cb7add7ee9c8