Adding hyperlinks to incorrect message

[mine-cetinkaya-rundel]

It's possible to add a hyperlink to the message displayed when an incorrect choice is selected for a multiple choice question, e.g.

question("What number is the letter A in the alphabet?",
         answer("8", message = "See [here](https://en.wikipedia.org/wiki/English_alphabet) and try again."),
         answer("14"),
         answer("1", correct = TRUE),
         answer("23"), 
         allow_retry = TRUE
         )

However in most cases I'd like to display the same incorrect message for all wrong answers, so would like to be able to do something like the following.

question("What number is the letter A in the alphabet?",
         answer("8"),
         answer("14"),
         answer("1", correct = TRUE),
         answer("23"), 
         incorrect = "See [here](https://en.wikipedia.org/wiki/English_alphabet) and try again.",
         allow_retry = TRUE
         )

This doesn't give an error however the hyperlink does not work. I think it would be a nice feature to add. The current alternative is the following, which requires repeating the message for each option.

question("What number is the letter A in the alphabet?",
         answer("8", message = "See [here](https://en.wikipedia.org/wiki/English_alphabet) and try again."),
         answer("14", message = "See [here](https://en.wikipedia.org/wiki/English_alphabet) and try again."),
         answer("1", correct = TRUE),
         answer("23", message = "See [here](https://en.wikipedia.org/wiki/English_alphabet) and try again."), 
         allow_retry = TRUE
         )

[jjallaire]

You could write an R function that automates the repetitive message:

alphabet_answer <- function(x) {
  answer(x, message = "See [here](https://en.wikipedia.org/wiki/English_alphabet) and try again.")
}

[mine-cetinkaya-rundel]

@jjallaire Sure, that's a good workaround too. I think it might be nice to have it built into the incorrect argument since it's already there for this purpose but doesn't allow for hyperlinks.

[jjallaire]

Yes, you are right that it's an oversight to now allow HTML for incorrect. We will fix that!

[mine-cetinkaya-rundel]

Great, thanks @jjallaire. Once that's in I can do a PR to the help file indicating this feature is available for these messages. Being able to point directly to resources is a nice feature.