Consider the following script:
echo strwidth(nr2char(0x1F48E))
. It should display “2” because 0x1F48E is a fullwidth ruby symbol. But Vim
actually displays “1”. This causes rendering bugs at least in terminal because
unlike Vim terminal (Konsole) knows that ruby symbol occupies two display
cells. Problem can be observed with the following script:
vim -u NONE -i NONE -N --cmd 'set encoding=utf-8' -c 'call setline(".",
["(" . nr2char(0xFF21) . ")", "(" . nr2char(0x1F48E) . ")"])' -c 'normal! G$'
. Display bug:
http://img-fotki.yandex.ru/get/15583/9151298.5/0_af494_e6a1fc7e_orig.png:
(Ａ)
(█☐)
(where third character on second line character is the inversed version of the
first one: black box with white frame) with cursor on the third character on
the second line in place of
(Ａ)
(💎)
with cursor on the last parenthesis. Vim version is 7.4.540 (from
https://bitbucket.org/ZyX_I/vim/changeset/b96a442ce32c1747da2b07ca3410217ba2f38d8d).
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