>>> As Joey highlights it on [[plugins/contrib/po]], it's too late to
>>> merge such a change, as the 3.x plugin API is released and should
->>> not be broken. I'm thus proposing to keep the existing
->>> `renamepage` as it is, and call `rename` the global hook I need.
->>> --[[intrigeri]]
+>>> not be broken. I will thus keep the existing `renamepage` as it
+>>> is, and call `rename` the global hook I need. --[[intrigeri]]
+
+>>>> [[Done]] in my `po` branch. --[[intrigeri]]
+
+I think I see a problem in the rename hook. The hook is called
+before the plugin adds any subpages to the set of pages to rename.
+So, if the user choses to rename subpages, po will not notice
+they are moving, and will not move their po files.
+
+Perhaps the hooks should be moved to come after subpages are added.
+This would, though, mean that if the hook somehow decides to add
+entirely other pages to the list, their subpages would not be
+automatically added.
+
+I also have some qualms about the design of the hook. In particular,
+passing the mutable array reference probably makes it impossible
+to use from external plugins. Instead it could return any additional
+rename hashes it wants to add. Or, if the ability to modify existing
+hashes is desired, it could return the full set of hashes.
+
+--[[Joey]]
+
+> I fixed the last part, i.e. a rename hook function now returns the
+> full set of hashes. As I also converted it to take named parameters,
+> such a function still is passed a reference to the original array,
+> though, because one can't build a hash containing an array of hashes
+> as a value, without passing this array as a reference.
+>
+>> Sure.
+>
+> I'm not entirely sure about your first concern. Calling the hook
+> before or after the subpages addition both have their own problems.
+>
+> What about running the hook before *and* after the subpages
+> addition, with an additional `when` named parameter, so that
+> a given hook function can choose to act only before or after, or both?
+>
+> --[[intrigeri]]
+>>
+>> Have you thought about making the hook be run once *per* file that is
+>> selected to be renamed? This would even handle the case where two
+>> plugins use the hook; plugin A would see when plugin B adds a new file
+>> to be renamed. And the subpage renaming stuff could probably be moved
+>> into the rename hook too. --[[Joey]]
+>>>
+>>> I've implemented this nice solution in my po branch, please review.
+>>> I'm slowly coming back to do the last bits needed to get my po and
+>>> meta branch merged. --[[intrigeri]]
+
+>>>> It looks good. I made some small changes to it in my own po branch.
+>>>> Nothing significant really. If this were not tied up in the po branch,
+>>>> I've have merged it to master already. --[[Joey]]
+
+>>>> Thanks, this is great :) --[[intrigeri]]