navigateChain in polyfill does not seem to always use supplied focusable option parameter

[jervisfm]

There seems to be an issue with the navigateChain method.

When it's called with the parameter option of 'all', e.g. from the spatial navigation action api here

spatial-navigation/polyfill/spatial-navigation-polyfill.js

Line 173 in efd4418

navigateChain(eventTarget, container, 'all', dir);

then this 'all' option value is not always used to find candidates. In particular, it's omitted in this container.focusableAreas() invocation here:

spatial-navigation/polyfill/spatial-navigation-polyfill.js

Line 558 in efd4418

if (focusingController(eventTarget.spatialNavigationSearch(dir, container.focusableAreas(), container), dir))

The end effect is that sometimes spatial navigation does not look beyond what's visible on the screen to move focus despite the current focused element having spatial navigation action value of 'focus' indicating automatic focus movement.