(#91) portal: make sure that widget DOM is attached when linking

Conflicts:
	CHANGELOG.md
(#91) portal: make sure that widget DOM is attached when linking: specs
Merge branch 'feature-0.16.x/91-fix-widget-visibility-during-link' into release-0.16.x

* feature-0.16.x/91-fix-widget-visibility-during-link:
  (#91) portal: make sure that widget DOM is attached when linking: specs
  (#91) portal: make sure that widget DOM is attached when linking
release v0.16.2