Issue #2353393 by tstoeckler: Use LanguageInterface::DIRECTION_LTR instead of 'ltr' directly.
Issue #2353005 by arpitr: Remove deprecated function views_get_enabled_display_extenders.
Issue #2352857 by thamas: Fixed Improve the display of trigger icon (pencil).
Issue #2246675 by rpayanm, johnstorey, holly.ross.drupal | mgbellaire: Remove all unnecessary 'template' lines in hook_theme() declarations.