Flags don't look right in the repl

[LilithHafner]

Expected:

julia> x = "🏳️‍⚧️"
"🏳️‍⚧️"

julia> print(x)
🏳️‍⚧️

Actual (characters):

julia> x = "🏳️‍⚧️"
"🏳️\u200d⚧️"

julia> print(x)
🏳️‍⚧️

Visual rendering on a Mac terminal:

VSCode:

Originally posted by @PallHaraldsson in #46104 (comment)

[KristofferC]

How does it look in your terminal outside of Julia?

[giordano]

Marginally related: #40071 (that's about the parser, but still related to emojis using ZWJ)

[LilithHafner]

How does it look in your terminal outside of Julia?

[KristofferC]

VSCode:

[LilithHafner]

Mac VSCode:

[Keno]

Yeah, it's related to #40071, in that we always escape ZWJ, but probably shouldn't if they're part of an emoji-ZWJ sequence, since they have single character presentation. It's a bit of a mess of an encoding, but I think just treating emoji-ZWJ sequences the same as regular emoji is probably the correct thing to do. The VSCode issue is unrelated and will need to be raised there.