Minify_groupUri() doesn't notice changes in file inclusion/order

[mrclay]

Closed: See #41.

Originally reported on Google Code with ID 241

Paul Schwarz noticed that "while it does a good job of checking whether files have been
*modified* it makes no attempt to notice whether the group itself has been modified,
i.e. adding or removing sources from the group" (or re-ordered).

i.e. GroupUri needs to append a hash of the array of filesnames along w/ the max timestamp.
Here's what I recommend:
* always starts with "0" so RewriteRules doesn't need to change
* md5(serialize(array(filenames) + array(maxTimestamp)))
* output MD5 in base64 and strip +/=

Reported by mrclay.org on 2011-09-03 11:48:57

[mrclay]

This won't work either. Including full filepaths and mtimes is the only way to catch
modifications. On the plus side it won't make MD5's output longer.

Reported by mrclay.org on 2011-09-03 11:55:26

[glensc]

seems related: #28

so could be closed as duplicate of #41 ?