Multi-byte emojis are not displayed correctly

[protist]

Reproducible with an empty config (terminator -u -g /dev/null)

Describe the bug Multi-byte emojis are not displayed correctly as a single glyph. Instead, they are shown as the component glyphs.

To Reproduce Attempt to display a multi-byte emoji. For example any of the following three:

• 👨‍🔧 → 👨 (U+1F468 MAN) + (U+200D ZERO WIDTH JOINER) + 🔧 (U+1F527 WRENCH)
• 😵‍💫 → 😵 (U+1F635 DIZZY FACE) + (U+200D ZERO WIDTH JOINER) + 💫 (U+1F4AB DIZZY SYMBOL)
• 🇺🇸 → 🇺 (U+1F1FA REGIONAL INDICATOR SYMBOL LETTER U) + 🇸 (U+1F1F8 REGIONAL INDICATOR SYMBOL LETTER S)

Expected behaviour Emoji to be shown.

Screenshots In vim, the emoji above look like this.

Desktop (please complete the following information):

• OS or Linux Distribution: Arch Linux
• Version: Up-to-date
  • terminator 2.1.2-1
  • vte3 and vte-common 0.70.1-1
• Display Technology: X11

Additional context I'm not entirely sure if this is a terminator bug, so apologies if I have gotten this wrong. I also tested in three other terminals: Alacritty, Konsole, and Gnome Terminal. All of these also failed. Gvim also fails. However, opening the text document containing the emoji above in a GUI text editor works.

[mattrose]

If Gnome-terminal also failed, this is definitely a vte bug. Terminator lets vte handle all that. Please open an issue at https://gitlab.gnome.org/GNOME/vte/-/issues

[protist]

Thanks @mattrose. Could you please confirm if this is the same bug? It only mentions flags, but I'm not sure if the ZWJ part is relevant.