This will allow our callers who are capable of dealing with
readonly folders to properly detect this condition and act
accordingly.
One example is Gmail's "Chats" folder that is read-only,
but contains logs of the quick chats.
Minor Changelog improvements.
Tested-by: Abdó Roig-Maranges <abdo.roig@gmail.com>
Signed-off-by: Eygene Ryabinkin <rea@codelabs.ru>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>