bug#38717: display-line-numbers set to relative

["Franco A. Cortesi" <cortesifranco3@gmail.com>]

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When display-line-numbers is set to 'relative', the number of spaces before
the digits starts growing (to two) when the current line hits 43 in my
case. Of course, no other line has more than two digits as the screen only
has 56 lines in total so the growing of spaces (and columns) is not needed
at all and of course is undesired. This behavior seems to be correctly
implemented but for absolute line numbers, where hitting line 43 means the
bottom line is close to start showing numbers with three digits.

The current line always showing the absolute line number is another big
problem as it will make the number of columns to grow and srink anyway.
This growing and shrinking could be totally prevented if users were able to
remove or configure the contents of the current line indicator. If
configurable, a custom face would be also very good. For example a colored
"-" indicating the current line would be nice for many users.

Lastly and less important, it would be great to be able to remove the space
before the first numeric character! To make line-numbers-mode as less
invasive and noticeable as possible.


This feature (relative line numbers) is AWESOME, especially when used with
evil-mode as it allows to navigate the code VERY fast by prefixing
next/previous-line commands with exact numbers. No "fast mental math" (when
using absolute line-numbers) or inaccurate guessings are needed, only
correct information. But I think the first two issues should be addresed to
make relative line-numbers really usable without drawbacks.

Thank you for reading.

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