Re: on helm substantial differences

[Juri Linkov]

> The result of char-width can only ever be 0, 1, or 2.  On GUI frames,
> it doesn't always return the exact value, because characters can be
> wider than 1, but narrower than 2.  But no character should be wider
> than 2 columns.  Which characters did you see that required the width
> of 3 or 4?

I tried to set tab-width to 4, and the first character
that doesn't fit to the 4-column tab stop is:

ഐ       MALAYALAM LETTER AI

But (char-width ?ഐ) returns 1.  Some examples of more 4-column wide
characters where char-width returns 1:

ை       TAMIL VOWEL SIGN AI
ෛ       SINHALA VOWEL SIGN KOMBU DEKA
꧅       JAVANESE PADA LUHUR
𒐫       CUNEIFORM NUMERIC SIGN NINE SHAR2


Maybe there is another function that could return the real number of
tab columns a character takes on the screen?