GUI: Select tag numbers shortcuts

[e3rd]

We create a form

#!/usr/bin/env python3
from dataclasses import dataclass
from typing import Literal
from mininterface import run

@dataclass
class Env:
    foo1: str
    foo2: int
    foo3: float
    foo4: bool
    foo5: Literal["one", "two", "three"]


m = run(Env)
print(m.env)

Make it work so that if a select form is focused, hitting numbers would select the corresponding element, here hitting '1' would select 'one', and '2' would select 'two'.

Here, we bind shortcuts for mnemonics:

mininterface/mininterface/_tk_interface/utils.py

Line 290 in a9c4c70

adaptor.bind_shortcut(f"<Alt-{char}>", taking_focus)

When done, add the shortcuts to this manager:

mininterface/mininterface/_tk_interface/adaptor.py

Line 48 in a9c4c70

self.shortcuts = set(["F1: Show this help", "Enter: Submit form", "Escape: Cancel"])

We might need to turn the set into a class and add a 'remove' method or something so that the shortcut appear and disappear on de/focusing the select tag.