DirAccessPack: Fix dir_exists and file_exists for res:// paths #31440
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Both methods check against containers using relative paths as index,
so the
res://
part needs to be stripped.Fixes #26009.
This is not perfect yet when it comes to
DirAccessPack::file_exists
, andFileAccessPack::file_exists
is not implemented (like many other methods).I'll work on a thorough test case for the
DirAccess
andFileAccess
APIs to ensure that they behave the same on all platforms + packed flavors, or that expected inconsistencies are well documented.