Commentary.
Properly detect URLs with the alternate host as Forums URLs.
Fix ordering of cancel button in link long-press menu.
Fix crash when dismissing preview screen before network operation finishes.
Delete pointless argument.
Temporarily add log message to crash reports regarding "tried to present modally an active controller" exception.
Add logging to crash reports for Crashlytics issue #6418.

-[AwfulForumsClient listPostsInThread:...] getting a nil threadID when called
with a thread passed from the AwfulComposeTextViewControllerDelegate
implementation in AwfulForumThreadTableViewController.