Fixes UITabBar support when the edgesForExtendedLayout is .None Allows future support of other view controller containment with bottom bar adjustment.
Fixes UITabBar support when the edgesForExtendedLayout is .None
Allows future support of other view controller containment with bottom bar adjustment.

slackhq/SlackTextViewController,kobim/SlackTextViewController,slackhq/SlackTextViewController,kobim/SlackTextViewController