bash completion: negative boolean options does not auto complete

[myocytebd]

(v17.6.0)

Assume there is a boolean option named <opt>

Expected result:

Both --opt and --no-opt gets auto completion.

Actual result:

Only --opt gets auto completion.

[bcoe]

@myocytebd thank you for the bug report, sounds like a good first issue for someone.

[shadowspawn]

This may be working now: #2322