Delta: 🚀 Improve line number to make UI more like github

[kevinhwang91]

left side is github, right side is delta:

Here is my config about delta:

export GIT_PAGER="delta -n --syntax-theme=TwoDark -w 1 \
    --hunk-header-style='syntax bold' \
    --hunk-header-decoration-style='black box' \
    --file-style='yellow italic' \
    --file-decoration-style='yellow ul' \
    --minus-style='syntax #450a15' \
    --minus-emph-style='syntax #600818' \
    --plus-style='syntax #0b4820' \
    --plus-emph-style='syntax #175c2e' \
    --line-numbers-zero-style='#4b5263' \
    --line-numbers-minus-style='syntax #600818' \
    --line-numbers-plus-style='syntax #0b4820' \
    --line-numbers-left-format='{nm:^4} ' --line-numbers-right-format='{np:^4}  '"

From the above image, UI of delta about line number is so weird.

[dandavison]

Hi @kevinhwang91, yes you're right, the background colors aren't making much sense currently :/ Thanks for this! I'll have another think about this and modify the behavior (without changing the interface hopefully) so that the background colors form contiguous blocks in this situation.