Compatibility tweak for add-ons which extend the <xf:pagenav feature by allowing $threadNavTotal/$threadNavParams/$navLinkPrefix to be set for normal thread modes (and similar for Conversations)
Recommended if using various ThemeHouse add-ons which interact with thread page navigation.
Possible work-around for threadmark next/previous buttons sometimes not moving between threadmarks as expected due to out of sync threadmark position data
Fix 'undelete threadmark' permission not being used as expected when undeleting a threadmark
Fix php 7.3 compatibility when attempting to view a threadmark list which doesn't exist