Not all emoji are working correctly

[D3vil0p3r]

Hello, I'm using terminology with DroidSansMono font style and I note that the most of emojis are shown correctly while some emoji does not.

The emoji that is not shown correctly is the ⚔️ . How is it possible to fix it?

PS: I tested the font style also on other terminals (i.e., kitty) and ⚔️ is shown correctly. I have this issue only on terminology.

[borisfaure]

Could you please take a screenshot so that I can see how it's not shown correctly?

[D3vil0p3r]

Sure @borisfaure . As test, I put crossed swords emoji and also other working emoji on shell prompt, and also on the input field of the terminal.

On top of the image there is Terminology, on bottom there is Kitty terminal.

[borisfaure]

That's a very interesting bug.
The way terminology decides how wide a character should be displayed, is based on the unicode specification: 2 blocks when the codepoint (character) has a East Asian Width property set to Wide or Ambiguous. (see https://www.unicode.org/reports/tr11/ ) . This is done in termptydbl.c that I've just updated in c31d11d to support the latest unicode specification (15).

This codepoint is set as Neutral: https://codepoints.net/U+2694
I think this is a bug in unicode itself since I don't see why https://codepoints.net/U+2693 is set to Wide and not this one.

I tried to use the emoji property in the unicode specification to decide how large a codepoint should be displayed but it was even worse because some symbols can be rendered narrowly like ❤ despite having the emoji property (https://codepoints.net/U+2764).
I will probably let the user decide whether the emoji property is good way to know how large a codepoint must be rendered.

In terminology, I think you don't see an emoji for the ⚔ codepoint because you're not using the same font in Terminology and in Kitty. The font used in Terminology is able to render this codepoint and does not fallback to an other font. Could please test with the same fonts?

[D3vil0p3r]

@borisfaure I did the test, I used on both of Kitty and Terminology the same font (JetBrains Mono (Medium)) and the result is the following (on top Kitty, on bottom Terminology):

[JosBosmans]

For extra screenshot's sake, this is foot and terminology displaying the same input with the same font (IBM Plex Mono).