Plugin to provide an relationship handler for comment parent

Maybe some wordings corrections are necessary:

1. +++ b/plugins/relationships/comment_parent.inc
   @@ -0,0 +1,40 @@
   + * Plugin to provide an relationship handler for comment parent.
   

   "a relationship"

2. +++ b/plugins/relationships/comment_parent.inc
   @@ -0,0 +1,40 @@
   +  'title' => t('Comment parent'),
   

   "Parent comment" - to indicate that the result of the relationship is comment, not node. The same change should be made elsewhere.

It works and looks reasonable.

Why have a blank settings form? This is a feature request also, not a bug.

@japerry: You need a blank settings form function otherwise the Panels UI won't give you the settings item in the context menu.

.. though after looking at the others in plugins/relationships I'm not sure it's needed.

This patch removes the empty settings form.

No, no. You removed the form but left the reference in $plugin array.

Requirements for forms are so various across the different plugin types!

Ah, thanks for noticing that.

Moving this to the v7.x-1.10 release plan.

I renamed your patch to have more descriptive name.

This didn't get added to 7.x-1.10.

The 3 year old patch in #16 to comment_parent.inc applied cleanly to the latest ctools 7.x-1.x-dev and if still relevant needs to be added to the #2984057: Plan for CTools 7.x-1.15 release.

If someone following this and is using the patch can RTBC this, I'll add it in the next release.

I will check it.

@andrey ... bump?

Bump too, still looking for an RTBC from someone using this feature

I'll trust it works, thanks @DamienMcKenna, @MerryHamster, et al, I've committed this to the dev branch for 1.18 release.