Use diff faces for compare-windows

* lisp/vc/compare-w.el: Require diff-mode for diff faces.
(compare-windows-removed, compare-windows-added): New faces
inheriting from diff faces.
(compare-windows): Define obsolete face alias.
(compare-windows-highlight): Replace face `compare-windows' with
new faces `compare-windows-added' and `compare-windows-removed'.
(compare-windows-get-recent-window): Signal an error when
no other window is found.

Fixes: debbugs:19451

1 files changed, 4 insertions, 1 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 14933aa8b0c..4d632783812 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -401,10 +401,13 @@ and comments.
 the color range from `vc-annotate-color-map' is applied to the
 background or to the foreground.
 
-*** compare-windows now compares text with the most recently used window
+*** `compare-windows' now compares text with the most recently used window
 instead of the next window.  The new option `compare-windows-get-window-function'
 allows to customize this.
 
+*** Two new faces `compare-windows-removed' and `compare-windows-added'
+replace the obsolete face `compare-windows'.
+
 ** Calculator: decimal display mode uses "," groups, so it's more
 fitting for use in money calculations; factorial works with
 non-integer inputs.