SeleniumHQ/selenium — pull request #161 by zch (2014-01-15 13:00:28+00:00)
Title: Regard all modifier keys as such in SingleKeyAction

Keys.META, Keys.COMMAND, Keys.LEFT_ALT, Keys.LEFT_CONTROL
and Keys.LEFT_SHIFT are now also regarded as modifier keys
in SingleKeyAction. This fixes the issue reported in
https://code.google.com/p/selenium/issues/detail?id=4843