[PATCH v3] emacs: make faces readable on dark backgrounds.

[David Bremner]

Matt Armstrong <marmstrong at google.com> writes:

> The notmuch-tag-flagged, notmuch-search-flagged-face and
> notmuch-crypto-part-header faces defaulted to "blue", which is nearly
> unreadable when a dark background is in use.  This is addressed by using
> "LightBlue1" for dark backgrounds.
>
> As a side effect, these faces are now no-op definitions for grayscale or
> mono displays.

pushed to master

d