Firacode: Adding new ligature: *= and+=

[Geolim4]

Hello,

I think it would be great to add the following ligature:
+= to ⩲
*= to ≛

And maybe -= to some equivalent if it exists. I did not found atm in math books.

[tonsky]

Might be too confusing if we render them like that. Also they need to stay 2× wide

[Geolim4]

I'm not sure that it would be more "confusing" that actual ligatures such as "==" and "===" or ">=" ?
On what your apprehensiveness's based on ?

[kiprobinson]

I don't like the ligatures suggested here, but could you make it so +=, -=, and *= have the symbol and the equals sign vertically centered? Right now the +, -, and * sit a little bit off-center of the equals sign.

[cvtsi2sd]

-1, the current >= / <= != ligatures produce very well-known and clear mathematical symbols, while I don't think I ever saw the proposed += / *= symbols. Also, at least as they are shown here on GitHub, the result provides _decreased_ clarity, as the + and * - arguably quite an important part of the operator - are very small over the = sign (in particular *, almost unreadable).

[Geolim4]

Okay I get it, it's just weird to have operators ligated in common languages and some not, visually it was about having consistency in ligaturing. But I agree completely with @kiprobinson Off-centered chars are a bit disturbing.

[tonsky]

Will fix +=, -=, and *=, thx!