kshenoy/vim-signature — pull request #39 by jeetsukumaran (2014-03-18 15:42:34+00:00)
Title: Support for quick-toggling of next mark on line and fix for mark exhaustion handling

- Added support for `m.`: if no mark on line, place next mark; if mark(s) on line, remove first one
- Mark exhaustion was not handled correctly: list should be checked to see if empty before trying to index element