Re: [RFC/PATCH] builtin/blame: darken redundant line information

[Junio C Hamano <gitster@pobox.com>]

Stefan Beller <sbeller@google.com> writes:

> * As you have an individual color setup, maybe you can fix this
>   for you by setting the appropriate slots to your perception of
>   dimmed?

I do not think it is possible with only {new,old}{,alternative} 4
colors.

Consider this diff:

         context
        -B
        -B
        -B
        -A
        -A
        -A
         context
        +A
        +A
        +A
        +B
        +B
        +B
         context

Two blocks (A and B) that are adjacent are moved but swapped to form
a pair of new adjacent blocks.  

We would like the boundary between the last "-B" and the first "-A"
to be highlighted differently; all other "-A" and "-B" lines do not
disappear but go elsewhere, so they want to be dimmed.

The newly added 6 lines are actually moved from elsewhere, and we
would like the boundary between the last "+A" and the first "+B" to
be highlighted differently, and others are dimmed.  

So I'd think you would need at least two kinds of highlight colors
plus a dimmed color.

         context
        -B		dim
        -B		dim
        -B		highlight
        -A		highlight
        -A		dim
        -A		dim
         context
        +A		dim
        +A		dim
        +A		highlight
        +B		highlight
        +B		dim
        +B		dim
         context

If old_moved and old_moved_alternative are meant for highlighting
"-B" and "-A" above differently, while new_moved and
new_moved_alternative are for highlighting "+A" and "+B"
differently, you'd need a way to specify "dim" for old and new moved
lines, which seems to be impossible with only 4 new colors.