plugin chat: fixed dropdown: dropdown was calling "open" each time a key was pressed, abd open is calling dismiss if dropdown is already opened. But dismiss is calling _real_dissmiss with a schedule, resulting in incoherent state and the dropdown not closed when expected. A check is now done to call "open" only when there is not already a dropdown, and to call dismiss when the text input is empty.

syntax: glob
*.pyc
*.pyv
*.swp
*.swo
tags
*.un~
Session.vim