Wrong highlight for wildcards in input redirection

[f1u77y]

Reproduction steps:

1. Type a command with a wildcard in input redirection in a such way that's exactly one match for that wildcard(let it be cat < /dev/ur*ndom)

Expected behaviour

fish should highlight /dev/ur*ndom with $fish_color_redirection or don't execute command correctly

Observed behaviour

fish highlights /dev/ur*ndom with $fish_color_error but executes command correctly

Additional information

$ fish --version
fish, version 2.2.0

[ridiculousfish]

Nice find

[ridiculousfish]

We were neglecting to set the generation count for the background highlighting thread, so we were always cancelling the highlight (thinking we were interrupted).