feat: ctrl+h for bindings on mac

[nimma15]

Ctrl+h for bindings on Mac, while saving alt+g for linux and windows
On Mac, Option+G produces the © symbol instead of sending an Alt+G key event, so the bindings help action is inaccessible to Mac users without terminal reconfiguration. Since Ctrl+H is traditionally a backspace alias that micro already handles via the Backspace key itself, repurposing it for bindings has minimal impact

[dmaluka]

Why?

[nimma15]

Why?

On Mac, Option+G produces the © symbol instead of sending an Alt+G key event, so the bindings help action is inaccessible to Mac users without terminal reconfiguration. Since Ctrl+H is traditionally a backspace alias that micro already handles via the Backspace key itself, repurposing it for bindings has minimal impact

[dmaluka]

I see.

Actually, I see this in micro's README:

Note for Mac: All micro keybindings use the control or alt (option) key, not the command
key. By default, macOS terminals do not forward alt key events. To fix this, please see
the section on macOS terminals further below.

[...]

If you are using macOS, you should consider using iTerm2 instead of the default terminal (Terminal.app). The iTerm2 terminal has much better mouse support as well as better handling of key events. For best keybinding behavior, choose xterm defaults under Preferences->Profiles->Keys->Presets..., and select Esc+ for Left Option Key in the same menu. The newest versions also support true color.

If you still insist on using the default Mac terminal, be sure to set Use Option key as Meta key under
Preferences->Profiles->Keyboard to use option as alt.

So this applies to any Alt keybindings, not just to Alt-g? And micro has a bunch of other default Alt keybindings besides Alt-g. So nothing really special about Alt-g here?

[dmaluka]

Anyway,

On Mac, Option+G produces the © symbol instead of sending an Alt+G key event, so the bindings help action is inaccessible to Mac users without terminal reconfiguration. Since Ctrl+H is traditionally a backspace alias that micro already handles via the Backspace key itself, repurposing it for bindings has minimal impact

Could you add this explanation to the commit message?

[JoeKar]

But OldBackspace still has a meaning:

micro/internal/action/bindings.go

Lines 516 to 517 in 363cd2b

	"Backspace": tcell.KeyBackspace2,
	"OldBackspace": tcell.KeyBackspace,

Doesn't this influence/brake present binding configurations?
It changes first with tcell v3, where tcell treats KeyBackspace2 as KeyBackspace.