Callback exiting :Gdiff to restore folds

[tylerball]

I use the following autocommands to save my open and closed folds in files.

au BufWinLeave          ?* silent! mkview!
au BufWinEnter,BufRead  ?* silent! loadview

Of course, vimdiff resets the folding and this is as close as I can get to restoring after closing :Gdiff:

au BufWinLeave fugitive://* silent! loadview

But this doesn't work when you <C-W><C-O> from the original buffer for example. Is there a callback or
something I could watch for to achieve this?

I believe it might help with #128 as well.

[tylerball]

This works a lot better, but I still need to manually :loadview after exiting Gdiff

function! SaveFolds()
    let match = matchstr(bufname('%'), '^\(\(fugitive.*\)\@!.\)*$')
    if !empty(match)
        au! BufWinLeave silent mkview!
        au! BufWinEnter silent loadview
        silent loadview
    endif
endfunction
au BufReadPost * call SaveFolds()