robustify code against null paginationInfo + adjusted edge-case for RTL flow rectangle detection method
restore reading position when resize (upper left corner, so approximate)
fix / workaround for  WebKit / Chromium regression bug with CSS columns and vertical writing mode + Right To Left page progression direction
Merge remote-tracking branch 'origin/develop' into feature/prevNextPage

Conflicts:
	js/views/cfi_navigation_logic.js