[TIMOB-13435] (3_1_X)  iOS: Label stuck in highlighted mode

Backport of PR #4116

Test is in [JIRA](https://jira.appcelerator.org/browse/TIMOB-13435)
Regress against 

[TIMOB-6384](https://jira.appcelerator.org/browse/TIMOB-6384)
[TIMOB-6431](https://jira.appcelerator.org/browse/TIMOB-6431)
[TIMOB-7397](https://jira.appcelerator.org/browse/TIMOB-7397)

Follow the trail of linked tickets in the tickets listed above (especially TIMOB-7397) to do a full pass.

Also please run Kitchen Sink