Instead of re-writing the same condition each time, I put the function
in an autoload plugin instead (which is going to be loaded just about
every time I start writing code, but that's neither here nor there) to
stop repeating myself.
You're supposed to undo the changes that you made to a buffer's
variables when doing filetype-related settings. The variable
'b:undo_ftplugin' contains the commands necessary to revert any changes
that you have made to accomodate this filetype.
I removed the mappings for left and right in a quickfix windows because
I don't use them, and the 'qf' plug-in already maps those (meaning I had
an error when I tried to unmap them after qf already did so).
Bruno BELANYI