Focus issues with layout “enew” in MacVim

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I don't know if this is an issue with MacVim or fzf.vim.

When exiting a window with g:fzf_layout = { 'window': 'enew' } in MacVim, an extra key is needed before focus is regained.

For example, in my .vimrc, I mapped:
`nnoremap e :Buffers`

After selecting a buffer, the command prompt reads :Buffers and I need to press some key before `e` works again.