[CMS PR 25559] Handle files which have been renamed only

[richard67]

Pull Request for joomla#25559 .

Summary of Changes

Files which have been renamed only shall not be in the list of files to be deleted.

A separate list shall be created for these instead, containing both the old and the new full path.

Renamed means they have base name with different upper or lower case, but everything else is the same, i.e. the directory is the same, case-sensitive.

In the same way as it is with the already existing lists, it can be that from one release to the other a file is renamed from "A" to "a", and then later again from "a" to "A".

Currently this happens when comparing 4.0 Beta 1 with 3.10 last nightly, which results in the rename like this:

'/libraries/src/Filesystem/Support/StringController.php' => '/libraries/src/Filesystem/Support/Stringcontroller.php'

And later when comparing 4.0 Beta 7 with Beta 6, we get:

'/libraries/src/Filesystem/Support/Stringcontroller.php' => '/libraries/src/Filesystem/Support/StringController.php'

But this can also happen with the list of deleted files when a file has been deleted and later is added back: It has to be checked with the previous release's comparion.

[richard67]

This will work for sure on Linux and Windows, but it might not work for iOS where it would need a real scandir because even realpath or glob don't return the real casing in all cases, see the experiment I had with fixFilenameCasing until I found a way.