Issue #80: suggestion: indication of 80-chars limit in diff view (conservancy/kallithea)

[Thomas De Schampheleire]

New issue 80: suggestion: indication of 80-chars limit in diff view
https://bitbucket.org/conservancy/kallithea/issue/80/suggestion-indication-of-80-chars-limit-in

Thomas De Schampheleire:

In diff views, it would be nice to be able to see where the 80 / 120 / ... character limit is, mainly useful for code review in projects where there is a limit on line length.

Some example implementations:
- a kind of ruler at the top of each diff section (for each file) where column 10, 20, ... is indicated. 
- similar to vim's colorcolumn, a permanent different background color of column 80, 120, ...
- an indication on the line itself, only visible when hovering the line

The columns to highlight could be fixed, a configuration option (per project, or per user), or dynamically changeable at the top of the diff view (with a default value).