Bug 3370191
The documented behavior is to hide the error when the text changes.
However, this should not be the case if the error was reset by a text watcher.
Comparing errorBefore and errorAfter as was done before is not sufficient in the
case where the error is reset to the same value. String pool optimization will re-use
the same Object and it will look like the error has not been modified (hence the
blinking behavior reported in the bug).
For this reason, TextView has a mErrorWasChanged flag. The fix is to export methods
that can use this flag as in done inside TextView when a physical keyboard is used.
These methods are hidden.
Change-Id: Ie3ec59a368f3b1588b81242890b971ac48e8ff7e
b7fc63f7aa