Completing `less -` offers `-"` as a candidate. Accepting it literally
inserts `-"`. I think it should offer `-\"` and insert the same.

My naive patch (posted below) fixes this issue but not completely.
Unexpected behavior with the patch:

  - Completing `less -\" x -` doesn't list any flags.
  - Completing `less --quote=x -` lists `-\"`.

I was unable to fix these.

Roman.

P.S.

`-#` has the same issue.

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