Excessively long temp names preventing "get" on Windows

Please describe the problem.

Getting a file with a long name on Windows fails due to doubling the size of the path in the "misctmp" directory.

What steps will reproduce the problem?

get [Connectivity and Thought - The Influence of Semantic Network Structure in a Neurodynamical Model of Thinking] marupaka_creativity_NN12.pdf (from origin...)
SHA256-s588307--41bf10d5c3a924808c6219395758354d7b6c4ff0a75e0d1a90e798fac015536c
        588,307 100%  670.38kB/s    0:00:00 (xfr#1, to-chk=0/1)
(checksum...)
git-annex: MoveFileEx "..\\..\\.git\\annex\\tmp\\SHA256-s588307--41bf10d5c3a924808c6219395758354d7b6c4ff0a75e0d1a90e798fac015536c" "..\\..\\.git\\annex\\misctmp\\[Connectivity and Thought - The Influence of Semantic Network Structure in a Neurodynamical Model of Thinking] marupaka_creativ.0\\[Connectivity and Thought - The Influence of Semantic Network Structure in a Neurodynamical Model of Thinking] marupaka_creativ": does not exist (The system cannot find the path specified.)
failed
git-annex: get: 1 failed

Note that the second argument to MoveFileEx is longer than 256 characters, because the name of the file gets doubled for the temp directory.

What version of git-annex are you using? On what operating system?

git-annex version: 6.20160427-gd0036b9
build flags: Assistant Webapp Pairing Testsuite S3(multipartupload) WebDAV ConcurrentOutput TorrentParser Feeds Quvi
key/value backends: SHA256E SHA256 SHA512E SHA512 SHA224E SHA224 SHA384E SHA384 SHA3_256E SHA3_256 SHA3_512E SHA3_512 SHA3_224E SHA3_224 SHA3_384E SHA3_384 SKEIN256E SKEIN256 SKEIN512E SKEIN512 SHA1E SHA1 MD5E MD5 WORM URL
remote types: git gcrypt S3 bup directory rsync web bittorrent webdav tahoe glacier ddar hook external
local repository version: 5
supported repository versions: 5 6
upgrade supported from repository versions: 2 3 4 5

OS: Windows 10

Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)

Yes, managing 30000 files, on operating systems other than Windows though...

fixed --Joey