Merge branch 'master' of ssh://git-annex.branchable.com

doc/bugs/git_annex_sync__58___--fast_and_REMOTE_should_be_exclusive.mdwn

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+### Please describe the problem.
+
+Without checking the manpage, I did:
+
+    cd usb-drive-1/annex
+    git annex sync --content --fast usb-drive-2
+
+I thought, that ´--fast´ would mean the same thing as in [[git-annex-copy]]:
+
+> When copying content to a remote, avoid a round trip to check if the remote already has content. This can be faster, but might skip copying content to the remote in some cases.
+
+Only here with [[git-annex-sync]], `--fast` means:
+
+> Only sync with the remotes with the lowest annex-cost value configured
+
+This is sub-optimal UI and this ship has sailed. But the command should have failed because it does not make sense to specify both --fast and a REMOTE, does it?
+
+I only noticed after a while that annex was syncing to remote at ~/annex and filling my laptops hard disk.
+
+I actually used `--fast` because I was annoyed by annex iterating over all files in the repo during the sync, which for some reason it doesn't do when syncing with an SSH remote.
+
+### What version of git-annex are you using? On what operating system?
+
+8.20200330, Debian testing

doc/git-annex-find/comment_8_d5846a41e2e227569d7d90dbb8edf7d8._comment

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+[[!comment format=mdwn
+ username="Ilya_Shlyakhter"
+ avatar="http://cdn.libravatar.org/avatar/1647044369aa7747829c38b9dcc84df0"
+ subject=""dry run" option"
+ date="2020-04-21T19:04:07Z"
+ content="""
+@Dan Related: [[todo/wishlist: --dry-run_option_for_all_commands/]] (but should probably move this thread to [[todo]]).
+"""]]