bug#48125: 28.0.50; Display garbled by emoji variation sequence

[Filipp Gunbin]

On 05/05/2021 14:49 +0300, Eli Zaretskii wrote:

>> From: Filipp Gunbin <fgunbin@fastmail.fm>
>> Cc: 48125@debbugs.gnu.org
>> Date: Tue, 04 May 2021 23:36:19 +0300
>>
>> Ok, I have two continuation backslashes in the end of the screen line
>> with soccer balls.  But what I wanted to note is that on continuation
>> lines, I get equal column numbers at different screen positions.
>>
>> I've now made two screenshots with point at each EOL, to show that
>> screen positions are different.
>
> OK, but what is the point you want to make?  current-column doesn't
> measure screen coordinates, it measures the sum of character-widths.
> A single-width character increments the column count by 1, a
> double-width character increments it by 2.  Given this fact, is there
> something wrong that you see with the reported column in each case?

I wanted to confirm that this all is ok, now you say just that, thanks.

For the record, from what I can see, Terminal has problems when
composing 2-column chars with that VARIATION SELECTOR-16 (and maybe
others).

Filipp