Re: badly calculated width of emoji in psql

On Wed, Jul 07, 2021 at 06:03:34PM +0000, Jacob Champion wrote:
> I would guess that's the key issue here. If we choose a particular
> width for emoji characters, is there anything keeping a terminal's font
> from doing something different anyway?

I'd say that we are doing our best in guessing what it should be,
then.  One cannot predict how fonts are designed.

> We could also keep the fragments as-is and generate a full interval
> table, like common/unicode_combining_table.h. It looks like there's
> roughly double the number of emoji intervals as combining intervals, so
> hopefully adding a second binary search wouldn't be noticeably slower.

Hmm.  Such things have a cost, and this one sounds costly with a
limited impact.  What do we gain except a better visibility with psql?

> In your opinion, would the current one-line patch proposal make things
> strictly better than they are today, or would it have mixed results?
> I'm wondering how to help this patch move forward for the current
> commitfest, or if we should maybe return with feedback for now.

Based on the following list, it seems to me that [u+1f300,u+0x1faff]
won't capture everything, like the country flags:
http://www.unicode.org/emoji/charts/full-emoji-list.html
--
Michael