[bug] wrong space width of emoji characters

[Freed-Wu]

space width after 2 and 0 is too long.

[black-desk]

I need more infomation:

• Terminal enmulator
• Font

[Freed-Wu]

• terminal: wezterm 20240203-110809-5046fc22
• font:

$ wezterm ls-fonts

Primary font:
wezterm.font_with_fallback({
  -- /usr/share/fonts/TTF/JetBrainsMonoNerdFontMono-Regular.ttf, FontConfig
  -- AKA: "JetBrainsMono NFM"
  "JetBrainsMono Nerd Font Mono",

  -- /usr/share/fonts/wenquanyi/wqy-zenhei/wqy-zenhei.ttc index=1 variation=0, FontConfig
  -- AKA: "文泉驛等寬正黑"
  -- AKA: "文泉驿等宽正黑"
  {family="WenQuanYi Zen Hei Mono", weight="Medium"},

  -- /usr/share/fonts/wenquanyi/wqy-microhei/wqy-microhei.ttc index=1 variation=0, FontConfig
  -- AKA: "文泉驛等寬微米黑"
  -- AKA: "文泉驿等宽微米黑"
  "WenQuanYi Micro Hei Mono",

  -- /usr/share/fonts/TTF/JetBrainsMono-Regular.ttf, FontConfig
  "JetBrains Mono",

  -- /usr/share/fonts/noto/NotoColorEmoji.ttf, FontConfig
  -- Assumed to have Emoji Presentation
  -- Pixel sizes: [128]
  "Noto Color Emoji",

})


When Intensity=Half Italic=true:
wezterm.font_with_fallback({
  -- /usr/share/fonts/TTF/JetBrainsMonoNerdFontMono-ExtraLightItalic.ttf, FontConfig
  -- AKA: "JetBrainsMono NFM"
  -- AKA: "JetBrainsMono NFM ExtraLight"
  {family="JetBrainsMono Nerd Font Mono", weight="ExtraLight", style="Italic"},

  -- /usr/share/fonts/wenquanyi/wqy-zenhei/wqy-zenhei.ttc index=1 variation=0, FontConfig
  -- Will synthesize italics
  -- Will synthesize dim
  -- AKA: "文泉驛等寬正黑"
  -- AKA: "文泉驿等宽正黑"
  {family="WenQuanYi Zen Hei Mono", weight="Medium"},

  -- /usr/share/fonts/wenquanyi/wqy-microhei/wqy-microhei.ttc index=1 variation=0, FontConfig
  -- Will synthesize italics
  -- Will synthesize dim
  -- AKA: "文泉驛等寬微米黑"
  -- AKA: "文泉驿等宽微米黑"
  "WenQuanYi Micro Hei Mono",

  -- /usr/share/fonts/TTF/JetBrainsMono-Regular.ttf, FontConfig
  "JetBrains Mono",

  -- /usr/share/fonts/noto/NotoColorEmoji.ttf, FontConfig
  -- Assumed to have Emoji Presentation
  -- Pixel sizes: [128]
  "Noto Color Emoji",

})


When Intensity=Half Italic=false:
wezterm.font_with_fallback({
  -- /usr/share/fonts/TTF/JetBrainsMonoNerdFontMono-ExtraLight.ttf, FontConfig
  -- AKA: "JetBrainsMono NFM"
  -- AKA: "JetBrainsMono NFM ExtraLight"
  {family="JetBrainsMono Nerd Font Mono", weight="ExtraLight"},

  -- /usr/share/fonts/wenquanyi/wqy-zenhei/wqy-zenhei.ttc index=1 variation=0, FontConfig
  -- Will synthesize dim
  -- AKA: "文泉驛等寬正黑"
  -- AKA: "文泉驿等宽正黑"
  {family="WenQuanYi Zen Hei Mono", weight="Medium"},

  -- /usr/share/fonts/wenquanyi/wqy-microhei/wqy-microhei.ttc index=1 variation=0, FontConfig
  -- Will synthesize dim
  -- AKA: "文泉驛等寬微米黑"
  -- AKA: "文泉驿等宽微米黑"
  "WenQuanYi Micro Hei Mono",

  -- /usr/share/fonts/TTF/JetBrainsMono-Regular.ttf, FontConfig
  "JetBrains Mono",

  -- /usr/share/fonts/noto/NotoColorEmoji.ttf, FontConfig
  -- Assumed to have Emoji Presentation
  -- Pixel sizes: [128]
  "Noto Color Emoji",

})


When Intensity=Bold Italic=false:
wezterm.font_with_fallback({
  -- /usr/share/fonts/TTF/JetBrainsMonoNerdFontMono-SemiBold.ttf, FontConfig
  -- AKA: "JetBrainsMono NFM"
  -- AKA: "JetBrainsMono NFM SemiBold"
  {family="JetBrainsMono Nerd Font Mono", weight="DemiBold"},

  -- /usr/share/fonts/wenquanyi/wqy-zenhei/wqy-zenhei.ttc index=1 variation=0, FontConfig
  -- AKA: "文泉驛等寬正黑"
  -- AKA: "文泉驿等宽正黑"
  {family="WenQuanYi Zen Hei Mono", weight="Medium"},

  -- /usr/share/fonts/wenquanyi/wqy-microhei/wqy-microhei.ttc index=1 variation=0, FontConfig
  -- Will synthesize bold
  -- AKA: "文泉驛等寬微米黑"
  -- AKA: "文泉驿等宽微米黑"
  "WenQuanYi Micro Hei Mono",

  -- /usr/share/fonts/TTF/JetBrainsMono-Regular.ttf, FontConfig
  "JetBrains Mono",

  -- /usr/share/fonts/noto/NotoColorEmoji.ttf, FontConfig
  -- Assumed to have Emoji Presentation
  -- Pixel sizes: [128]
  "Noto Color Emoji",

})


When Intensity=Bold Italic=true:
wezterm.font_with_fallback({
  -- /usr/share/fonts/TTF/JetBrainsMonoNerdFontMono-SemiBoldItalic.ttf, FontConfig
  -- AKA: "JetBrainsMono NFM"
  -- AKA: "JetBrainsMono NFM SemiBold"
  {family="JetBrainsMono Nerd Font Mono", weight="DemiBold", style="Italic"},

  -- /usr/share/fonts/wenquanyi/wqy-zenhei/wqy-zenhei.ttc index=1 variation=0, FontConfig
  -- Will synthesize italics
  -- AKA: "文泉驛等寬正黑"
  -- AKA: "文泉驿等宽正黑"
  {family="WenQuanYi Zen Hei Mono", weight="Medium"},

  -- /usr/share/fonts/wenquanyi/wqy-microhei/wqy-microhei.ttc index=1 variation=0, FontConfig
  -- Will synthesize italics
  -- Will synthesize bold
  -- AKA: "文泉驛等寬微米黑"
  -- AKA: "文泉驿等宽微米黑"
  "WenQuanYi Micro Hei Mono",

  -- /usr/share/fonts/TTF/JetBrainsMono-Regular.ttf, FontConfig
  "JetBrains Mono",

  -- /usr/share/fonts/noto/NotoColorEmoji.ttf, FontConfig
  -- Assumed to have Emoji Presentation
  -- Pixel sizes: [128]
  "Noto Color Emoji",

})


When Intensity=Normal Italic=true:
wezterm.font_with_fallback({
  -- /usr/share/fonts/TTF/JetBrainsMonoNerdFontMono-Italic.ttf, FontConfig
  -- AKA: "JetBrainsMono NFM"
  {family="JetBrainsMono Nerd Font Mono", style="Italic"},

  -- /usr/share/fonts/wenquanyi/wqy-zenhei/wqy-zenhei.ttc index=1 variation=0, FontConfig
  -- Will synthesize italics
  -- AKA: "文泉驛等寬正黑"
  -- AKA: "文泉驿等宽正黑"
  {family="WenQuanYi Zen Hei Mono", weight="Medium"},

  -- /usr/share/fonts/wenquanyi/wqy-microhei/wqy-microhei.ttc index=1 variation=0, FontConfig
  -- Will synthesize italics
  -- AKA: "文泉驛等寬微米黑"
  -- AKA: "文泉驿等宽微米黑"
  "WenQuanYi Micro Hei Mono",

  -- /usr/share/fonts/TTF/JetBrainsMono-Regular.ttf, FontConfig
  "JetBrains Mono",

  -- /usr/share/fonts/noto/NotoColorEmoji.ttf, FontConfig
  -- Assumed to have Emoji Presentation
  -- Pixel sizes: [128]
  "Noto Color Emoji",

})

Title font:
wezterm.font_with_fallback({
  -- /usr/share/fonts/TTF/Roboto-Bold.ttf, FontConfig
  {family="Roboto", weight="Bold"},

  -- /usr/share/fonts/TTF/JetBrainsMonoNerdFontMono-Regular.ttf, FontConfig
  -- AKA: "JetBrainsMono NFM"
  "JetBrainsMono Nerd Font Mono",

  -- /usr/share/fonts/wenquanyi/wqy-zenhei/wqy-zenhei.ttc index=1 variation=0, FontConfig
  -- AKA: "文泉驛等寬正黑"
  -- AKA: "文泉驿等宽正黑"
  {family="WenQuanYi Zen Hei Mono", weight="Medium"},

  -- /usr/share/fonts/wenquanyi/wqy-microhei/wqy-microhei.ttc index=1 variation=0, FontConfig
  -- AKA: "文泉驛等寬微米黑"
  -- AKA: "文泉驿等宽微米黑"
  "WenQuanYi Micro Hei Mono",

  -- /usr/share/fonts/TTF/JetBrainsMono-Regular.ttf, FontConfig
  "JetBrains Mono",

  -- /usr/share/fonts/noto/NotoColorEmoji.ttf, FontConfig
  -- Assumed to have Emoji Presentation
  -- Pixel sizes: [128]
  "Noto Color Emoji",

})

[Freed-Wu]

If we display #v[2]:

local candidate = string.sub(v[1], 1, #v[1] - 1) .. ' ' .. #v[2] .. ' ' .. v[2]

We can find the 6th candidate is 🫵🏻 not 🫵.
🫵🏻 is two character, first is 🫵, second is 🏻.

[Freed-Wu]

I think it is neovim's bug for combined emoji display.

[Freed-Wu]

[black-desk]

Let's keep this open.
I don't think this is a neovim issue.