This patch sets the environment variable OFFLINEIMAPSYNCMODE to either
full, quick or idle depending on the context of the pre- and
postsynchook.
Adding the context as an argument was considered but this would break
existing configurations and it makes calling a program directly more
cumbersome. Some programs (e.g. imapfilter) may not know what to do with
this extra argument.
Signed-off-by: Mart Lubbers <mart@martlubbers.net>
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