Proposal: Update minimum Emacs version to `29.1`

[charjr]

Arguments For

defvar-keymap

I've got a local branch ready to go that simplifies our keymap with the defvar-keymap macro, I wanted to push it then realised it was introduced in 29.1.

font-lock-function-call-face and font-lock-variable-use-face

These faces were introduced in 29.1 they distinguish between usage and declarations, i.e.

var foo:           # variable-name-face
    get:
        get_foo()  # function-call-face
 

func get_foo():    # function-name-face
    return foo     # variable-use-face

I do not have this ready-to-go but I would be happy to implement this. I prefer to emphasise function names like they're section headings, but I can't in GDScript because it gets obnoxious when every single function call is emphasised as well.

Probably a Bunch of Other Things I Don't Know About Yet 🤷

🔍

Arguments Against

We lose compatibility with older Emacsen.

Arguments Against the Arguments Against

• Emacs 29.1 was released July 2023, nearly three years ago.
• Debian's latest stable version (famous for its often outdated packages) offers 30.1
  • Debian's previous stable version offers 30.1 through backports.
  • If Debian has 29.1 I think it's safe for us to do so as well.
• Users on versions lower than 29.1 can just use the old version of gdscript-mode perfectly fine anyway.

[jcs090218]

I tend to support the latest 3 versions of Emacs, which are 28.x, 29.1x, and 30.x.

However, I think it's alright to drop 28.x since 31.x will probably be released soon. See https://www.reddit.com/r/emacs/comments/1t0hn1r/the_emacs31_branch_will_be_cut_in_one_week/. 🤔

[charjr]

I tend to support the latest 3 versions of Emacs, which are 28.x, 29.1x, and 30.x.

However, I think it's alright to drop 28.x since 31.x will probably be released soon. See https://www.reddit.com/r/emacs/comments/1t0hn1r/the_emacs31_branch_will_be_cut_in_one_week/. 🤔

That makes sense, technically the last tagged release does still support 28.x, but I can hold off on 29.x for now. There's always other bits of the codebase for me to explore first. 👀

[jcs090218]

Closed in #202.