Sort term-based facets by term weight

This is looking great! I actually had a question about this functionality very recently. Thanks!

I don't think I'll commit this without any tests though.

+++ b/src/Plugin/facets/processor/TermWeightWidgetOrderProcessor.php
@@ -0,0 +1,90 @@
+class TermWeightWidgetOrderProcessor extends SortProcessorPluginBase implements SortProcessorInterface, ContainerFactoryPluginInterface {

I think implements SortProcessorInterface is superfluous as the SortProcessorPluginBase already implements the same interface.

Test looks fine, committed! Thanks and sorry for letting this sit for so long.

Why this was removed here http://cgit.drupalcode.org/facets/commit/?id=632f9547f353f7b3a6c1cc0bd16... ?

@nicola85: Looks like I made a mistake while committing that patch, I'll try to see if the patch in #4 still applies.

Committed this again.

This functionality isn't working for me. Is it incompatible with using the hierarchy?

I'd like to display facets hierarchically, following the same sorting as the terms themselves, but the term weight sorting option doesn't seem to have any effect in my case.

@bmcclure: #2864336: Facet sorting for hierarchical vocabularies, so yeah, that currently doesn't work yet.

Adding the sort order key in the yml file.

@surbz could you open a new issue for that? That way we can track and give proper attribution. Thanks!

https://www.drupal.org/files/issues/sort_facets_by_weight-2833340-15.patch had a trailing white space , uploading the fixed one.

@borisson_ okay i will do that.
Thanks

This patch the sort order key in the yml file for 8.x-1.0-alpha6

https://www.drupal.org/files/issues/sort_facets_by_weight-2833340-18.patch had a trailing white space , uploading the fixed one.