Re: Proposing an Emoji Space character

Alexander Lange:
> 
> As far as I know, the width of emoji is aligned with ideographic fullwidth pretty much everywhere. So the question "why not use U+3000?" is almost certainly going to pop up.

I used to think so, too, but actually trying to mix emojis with East-Asian ideographic characters (space or otherwise) often does not lead to regular alignment, probably due to different fonts with different metrics being used or the font rendering engine switching to a special mode for color glyphs. The reason ultimately does not matter for people writing emoji texts, which may include 2-dimensional alignment across lines.

Some early emoji sets had emojis of varying widths and KDDI even had respective “blank” emojis: <http://emoji.digital/kddi-au/>. They were even included in L2/08080r-emoji-proposal as FULL BLANK SPACE, A HALF BLANK SPACE and A QUARTER BLANK SPACE (sic!).

⏹️🔼⏹️
◀️⏺️▶️
⏹️🔽⏹️

U+3000 IDEOGRAPHIC SPACE
　🔼　
◀️⏺️▶️
⏹️　⏹️

U+2001 EM QUAD
 🔼 
◀️⏺️▶️
⏹️ ⏹️

U+2003 EM SPACE
 🔼 
◀️⏺️▶️
⏹️ ⏹️

Hiragana
く🔼く
◀️⏺️▶️
⏹️く⏹️

Katakana
ク🔼ク
◀️⏺️▶️
⏹️ク⏹️

Bopomofo
ㄑ🔼ㄑ
◀️⏺️▶️
⏹️ㄑ⏹️

Hangul
ㅅ🔼ㅅ
◀️⏺️▶️
⏹️ㅅ⏹️

“Ideographic”
㆟🔼㆟
◀️⏺️▶️
⏹️㆟⏹️

Whereas mixing those with each other may give regular results:
く　ク
ㄑㅅ㆟