According to the User's Guide [1], an `assign` command allows a
`workspace` token after the selector, as an alternative or in addition
to the unicode arrow `→`. In reality, however, the `workspace` token is
not recognized.
Example:
assign [class="Firefox"] workspace "1: Browser"
should assign Firefox windows to workspace `1: Browser`, but the the
browser window appears on a new workspace called
`workspace "1: Browser"` instead.
With this fix, both `→` and `workspace` are recognized (and ignored)
after the selector.
[1] https://i3wm.org/docs/userguide.html#_automatically_putting_clients_on_specific_workspaces
194da2d7cf