line number padding

Description

it would be very much appreciated to be able specify a padding before (left of) the standard line number gutter.

this is for the purposes of centring the code more towards the middle of the screen. i have a wide monitor and having most of my code displayed at the very left of the terminal can be uncomfortable. it would be nice to be able to horizontally push or pull my code to where i like it most.

the default of zero [characters] would be for no additional padding, ie: current behaviour.

also: it would be unbelievably cool if a binding were available to increase/decrease this padding on the fly by 1 character at a time. some code is narrow, some code ain't - whatever's in the current buffer a few taps plus or minus to make it just right.

i've only just started using your editor and thus far i'm really excited to switch from the graphical editor i've always been nearly, but not quite, happy with.

thank you!

Start by locating the code that renders the line-number gutter and the existing binding/configuration entry points. Check how a zero-character default is represented and how buffer-specific settings are handled. Done means users can set padding before the gutter and adjust it by one character through bindings, while existing behavior remains unchanged by default.