People who are working with, for instance, MATLAB would appreciate this
patch since, according to the naming convension of MATLAB, package names
have to start with '+', but Command-T (just like Vim inself) fails to
open such names.
Tweaks from initial published version:
- added rationale from pull request to commit message
Signed-off-by: Wincent Colaiuta <email@example.com>