Fugitive commands not defined when opening via file-line plugin

[pbrisbin]

(Also opened, and promptly closed, at https://github.com/tpope/vim-fugitive/issues/602)

I've created a minimal reproducing repo here: https://github.com/pbrisbin/fugitive-bug, the following should show the bug:

• git clone https://github.com/pbrisbin/fugitive-bug && cd fugitive-bug
• vim -u vimrc foo.md +5
• Notice that :GDiff etc work as expected
• vim -u vimrc foo.md:5
• Notice that :GDiff etc are not defined

Perhaps this is the same issue underlying #42 and #39.

[bag-man]

For future Googlers, this issue is resolved in an alternative plugin here