bug#13686: hi-yellow vs. hi-lock-1

[Jambunathan K]

"Drew Adams" <drew.adams@oracle.com> writes:

> "hi-lock-1", "hi-lock-2", etc. are the best names.

My earlier mail asked for making the highlighting face a "core" one.  So
having highlight-1, highlight-2 etc as "core" themable faces will make
theme designers pay attention to it.

>From a theming perspective, the sequence 1, 2 etc are not merely opaque
names.  I have argued that they can be look at as "angles" on a "color
wheel".

So if we are looking at triads of colors, we are looking at colors at
positions n * 120 degrees apart on a color wheel.

The colors of highlight faces *should not* be chosen independently.
They should "gel" well with each other.  
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