Max Nikulin <manikulin@gmail.com> writes:

[...]
>
> I am sorry for my ignorance, I may confuse something since I have never 
> tried to type Greek using "gr" keyboard layout. Writing on possible 
> conflicts I have in mind mostly M-something keybindings. I am looking 
> into /usr/share/X11/xkb/symbols/gr polytonic symbols. AltGr+s in Greek 
> layout (<AC02> levels 3 and 4) are used to type "Ϛ ϛ STIGMATA". On the 
> other hand the "us" layout does not have level 3 and 4 symbols for 
> <AC02> "s" qwerty key. 

Stigmata refers to bodily marks, it's not a letter.  =Stigma= is a
ligature letter (meaning a combination of 2 letters, similar to "æ",
but was used _only_ in minuscule manuscripts to save space by combining
sigma (σ) + tau (τ).  Stigma is not part of the Greek alphabet.

All letters of the Greek alphabet are currently supported both in Emacs
and in the GNU system.  Only the polytonic system is lacking (᾿ ` ῾ ῀ ͺ).

> [AltGr+"{"] and [AltGr+"}"] are defined as dead keys for accents, so
> it may cause similar issues.

Thanks to quail there is no need for dead keys or using Meta/Control
key.  My current implementations is almost 1:1 with the greek keyboard
(monotonic implementation) from greek.el, just removed duplicated keys
(e.g W=Σ & S=Σ) to make space for the polytonic accents.

I will be typing a couple of greek texts for a personal project of mine,
testing what feels most fluid to type & upon completion I will be
sharing it with emacs-devel.

P.S Polytonic Greek is the same as the current Greek monotonic
implementation, just with 5 more accent/diacritical marks (᾿ ` ῾ ῀ ͺ).
Not sure what is going on with some implementations of it.

-- 
Thanos Apollo
https://thanosapollo.org