Kotlin decrypt: rendering of MDC error

[tomholub]

I'm posting it here but maybe it will be for a separate issue

Originally posted by @DenBond7 in #1347 (comment)

[tomholub]

[DenBond7]

@tomholub Also please specify a milestone

[DenBond7]

@tomholub

1. After some changes, we have the following for NO_MDC(Node - left, Kotlin - right)

Please note that PGPainless doesn't decrypt a message and throws an error.

2. For BAD_MDC we have the same situation.

[tomholub]

Thanks for the screenshots! Can resolve later.

[tomholub]

As long as it already looks like the last screenshots.

[tomholub]

Later, you'll probably want to change "hide original content" to a link-button that says "display dangerous content anyway". When clicked, you run decruption again but you supply some sort of ignoreMdc: true parameter to PGPainless. Then display the message content below, still leaving the previous red banner above.

If there isn't such mechanism to ignore MDC errors when decrypting, ask Paul if he could introduce it.

[DenBond7]

ref pgpainless/pgpainless#190