[vim/vim] Add Highlight Groups For Even and Odd Lines (Issue #10935)
Austin Liu
Is your feature request about something that is currently impossible or hard to do? Please describe the problem.
I think it's nice for even and odd lines to have different highlights. It lets me quickly see which number in the line-number column any particular line corresponds to, regardless of how much whitespace is in front of it. It's a nice quality of life improvement when using relative numbers.
Currently, chrisbra's "DynamicSigns" plugin implements this functionality by adding signs to each line and giving them a different highlight whether they're even or odd. However, when a file has a relatively large number of lines, this causes an extreme slowdown and becomes almost unusable. Additionally, there are times when the signs to not update automatically.
Describe the solution you'd like
A builtin option of highlighting even and odd lines differently (LineEven and LineOdd hl-groups?). Here is an image using the DynamicSigns plugin:
Additional context
I have no idea about the feasibility of this, but I'm hoping it's a feature that is reasonable to add.
The highlighting doesn't even necessarily need to be tied to the line; as long as adjacent lines have different highlights, it makes it easier to see what line number each line corresponds to.
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