[vim/vim] The symbol "﷽" isn't properly displayed (#3491)
yuri@FreeBSD
How to reproduce:
- Paste this text into vim: ﷽﷽﷽﷽﷽﷽﷽﷽
- Observe how individual symbols aren't distinguishable, they overlap and don't look anything like in the browser.
vim-8.1.0342 in the xfce4 terminal on FreeBSD-11.2
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Tony Mechelynck
This is due to the fact that in Vim, one character is one screen cell (or two cells for a "wide" East-Asian character). Now the basmala ligature U+FDFD is one "character" in the Vim sense of the word, but it corresponds to a lot of Arabic "letters", viz. (in some crude Latin letter-for-letter transliteration omitting harakat) bsm allh alrhmn alrhym. There's no way you can pack all this into the screen space meant for one letter and still make it understandable. Browsers, OTOH, use variable-length fonts, especially for highly cursive fonts like Arabic, and they will expand the basmala glyph to use any width it needs.
But don't worry, if you hit ga on that "unreadable" glyph in Vim and it tells you that (in UTF-8 'encoding') it has hex value FDFD, then it is indeed the basmala ligature, even though it is not recognizable in Vim.
Best regards,
Tony.
yuri@FreeBSD
one character is one screen cell (or two cells for a "wide" East-Asian character)
Why doesn't vim expand this, and allow other characters to occupy two cells, or perhaps 3 cells too?
Tony Mechelynck
Mostly history of Vim, and the use of monospace fonts. Vim is not a WYSIWYG text processor, remember, but a plain text editor, which ultimately dates from the time when multi-language was in its infancy, Arabic script rendering was unknown, Chinese was possible but largely reserved to East-Asian editions of the OS. I saw the first steps of the Arabic-in-Unicode module of Vim a few years ago, and AFAIK it still doesn't support Indian-subcontinent scripts like the Devanagari script used for Hindi.
Best regards,
Tony.
Bram Moolenaar
> > one character is one screen cell (or two cells for a "wide" East-Asian character)
>
> Why doesn't vim expand this, and allow other characters to occupy two
> cells, or perhaps 3 cells too?
which is what Vim is using. Vim doesn't render the glyph, it only tells
the rendering system (often a terminal emulator) to do that, and then
the width is totally unpredictable. On my Terminal it appears to take
about 10 cells. We just don't support that.
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avidseeker
A possible workaround is to manually insert ~10 spaces after Basmala character. Unless you're programming in Whitespace, you should be fine.
Basmala isn't the only extra-wide Unicode characters. There also
- DŽ
- ‱
- ௸
- ௵
- ꧄
- ꧅
- ⸻
- 𒈙
- 𒅃 𒈓
- 𒐪
Maybe Vim can insert "virtual non-existent spaces" (something like :tabstop) after such characters?
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