Node children tab => add childnode (existing one)

Seeing this issue is stemming from 2010 for 6.x, is there any progress in this feature request? Would love to have this too. I've got a project running which absolutely needs this kind of functionality, currently only possible - from the parent out - to create new child nodes.

This patch adds an autocomplete with which you can add child nodes. In order to do this, I moved a lot of code from nodehierarchy_widgets.module into the main nodehierarchy.module, and extended all that code to work for selecting children as well as parents.

The original module uses a select element for the parents, and only after enabling nodehierarchy_widgets you get an autocomplete. What this patch still needs is:

• a setting (instead of having to enable/disable a separate module) for choosing between an autocomplete vs. select element, for the parent selector. (The hook_nodehierarchy_get_parent_selector() may go away, it's not a real hook anyway.)
• then having that option of a select element for the children too.
• emptying out nodehierarchy_widgets.module, which then isn't necessary as a separate module anymore.

...but I'm not going to do that now.

This patch will only apply after applying #2335219-2: Reduce database queries by caching data and #1955860-5: node can be made a parent to itself first; I don't want to juggle too many patches in a module that isn't maintained anwyay.

And here's related functionality which you will want (though it arguably could be a separate issue): in the list of child nodes, add a 'remove' link to each child.

Since these things probably won't be committed for some time, for people's convenience I'm adding one big patch which includes

• #2337779: Delete unused menu links upon editing parent.
• #2335219: Reduce database queries by caching data
• #1955860: node can be made a parent to itself
• this patch