Adapting an existing session file to a new plugin

This is kind of a general question, but it has to do with issues
that have made coding life complicated for me in the past.

For a specific example of this topic, I have just installed the
drupal plugin for vim. I have an existing project that is loaded by
a session file and it is named

drupal_modules.vim

it is likely that drupal_modules.vim has settings that might
override the settings provided by the newly install drupal plugin.

Quite a large number of buffers are present in this session. It is
certainly doable, but is a bit of an inconvenience to to reload all
of them.

I have in the past done the following:
Delete all commands in the session file *except for* anything
starting with 'badd' or 'edit'.

That has worked, but sometimes I have ended up with syntax
highlighting being clobbered.

I'd welcome all comments that might make the transition easier.

thanks
--
Tim
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com, http://www.tj49.com

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