[Storage Access Framework] Handle DocumentsContract.EXTRA_LOADING, EXTRA_INFO and EXTRA_ERROR. #589
Description
DocumentsContract.EXTRA_LOADING, EXTRA_INFO and EXTRA_ERROR is not handled yet.
I just wanted to create a feature request to implement these fields because I use them for the DAVx⁵ DocumentsProvider and MaterialFiles is (next to AOSP Files, which implements those fields) the best open-source file manager (thanks!).