Fix bug where multiple cursors will lock-up forever if another plugin is doing stuff asynchronously.
Fix bug where multiple cursors will lock-up forever if another plugin is doing stuff asynchronously.

kristijanhusak/vim-multiple-cursors,roryokane/vim-multiple-cursors,martindale/vim-multiple-cursors,0hansen/vim-multiple-cursors,tony/vim-multiple-cursors,terryma/vim-multiple-cursors,jamesblunt/vim-multiple-cursors,rargo/vim-multiple-cursors