Added switchable relative line numbers

[hidden-being]

This request enabled the disabling of line numbers in the menu,
and switching row numbering to relative mode.

[lhecker]

I'm not sure if this is something we'd want just yet.

Edit: I have to say that I understand how this is helpful for vim. Its commands often take line number parameters (e.g. d7d to delete 7 lines). But this editor is always in visual mode, so I feel like this feature may be a bit too niche, given our focus on minimalism.

[ddad431]

A little opinion. Relative line numbers is not useful. In Vim, you can achieve this by combining visual mode with search, and it is more flexible.

Back to the topic, I think this PR can be split into two: (just my thoughts, feel free to ignore)

1. Added options to disable line number (Line numbers are not necessary.)
2. Combine select with search.
   • When text is selected and a search is performed, enable the combination mode.
   • Navigate to selected item, selecting all rows from the initial row to the row of the selected item.

[lhecker]

I'm not sure we would want such more advanced navigation features either. The main appeal of this editor is its simplicity, and if we made it into "yet another emacs" it would lose that aspect.

[ddad431]

I'm not sure we would want such more advanced navigation features either. The main appeal of this editor is its simplicity, and if we made it into "yet another emacs" it would lose that aspect.

This is just a random thought, and I'm only sharing a bit of my experience with using vim. There is no intention to complicate the issue or add to the maintainers' workload.

About simplicity, I'm a bit curious why line numbers are displayed by default instead of being an optional feature? I saw #22, I'm a bit concerned that setting line numbers requires a configuration file.

As for this PR, "Add options to disable line numbers" is at least meaningful.

[lhecker]

About simplicity, I'm a bit curious why line numbers are displayed by default instead of being an optional feature?

Modern editors universally display line numbers by default. In our case it's also useful because it doubles as a word-wrap indicator.

I'm a bit concerned that setting line numbers requires a configuration file.

It's because disabling line numbers every single time you open the editor would kind of suck. So being able to persist settings like that would be helpful.

[lhecker]

I'll close this PR for now, according to the reasoning I wrote above. I apologize for this.