permissions update for published nodes

[vbradnitski]

We need a way for a smooth permission change of published nodes without of republishing it.
Steps to poc:

• find all "master" versions of node and it's children.
• change permissions for it by creating new versions and redirection master branches on it.
• find the draft versions of the changed contents and redirect it to the new versions (only if master and draft referenced the same version before )

To investigate:

• diff of the trees in master and draft(diff pathes, extra content and so on)

[sigdestad]

@vbradnitski - I believe the above spec is not reflecting what we really want. Basically, when permissions are changed in one brach, all other branches must instantly reflect the same permissions for the same item. A solution might be to drop the "inherit permissions" flag in the data, and rather just propagate effective permissions on each item.

We can implement the inheritance feeling as a UI feature instead, if a permission line is the same as its parent, show it as grey.

This way, an editor can work in draft mode, change permissions in the tree, and permissions for all affected items are instantly updated across all branches. Should permissions be updated in the master brach, the same permissions will instantly be applied to drafts. A potential solution is simply to store permissions outside of versions, in a new nodeindex maybe?

[rymsha]

Redo inheritPermissions - is a much bigger task (including migration of blobs).
Besides algorithm described does not take into account that draft tree and master tree might be different.

We should stick to plan where we first try to modify as little code as possible. Description does not cover important detail - modify latest draft versions with new permissions. This is the first step. In the algorithm.