[FEAT] TextArea relative line numbers

[TomJGooding]

Sorry, I'm going to bite the bullet and make the first feature request for the new TextArea!

Would you consider adding an option for relative/hybrid line numbers?

[github-actions]

We found the following entry in the FAQ which you may find helpful:

• How do I center a widget in a screen?

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[TomJGooding]

I appreciate this feature request might be too niche. I've hacked together a custom TextArea class with a relative numbers option, which I'll share just for posterity (note you will need to copy and amend the existing render_line method).

class RnuTextArea(TextArea):
    relative_numbers: Reactive[bool] = reactive(False)

    @override
    def render_line(self, widget_y: int) -> Strip:
        # --snip--
            if not self.relative_numbers or line_index == cursor_row:
                line_number = line_index + 1
            else:
                line_number = abs(cursor_row - line_index)

            gutter = Text(
                f"{line_number:>{gutter_width_no_margin}}  ",
                style=gutter_style or "",
                end="",
            )
        # --snip--

[TomJGooding]

Closing as stale as there doesn't seem to be any appetite for this.

[github-actions]

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