From: Juri Linkov <juri@jurta.org>
To: Matt Armstrong <matt@rfc20.org>
Cc: 46396@debbugs.gnu.org, bug-gnu-emacs_at_gnu.org@tangential.info
Subject: bug#46396: 27.1.90; Ediff's non-focused diff section, background too light in --reverse
Date: Wed, 10 Feb 2021 19:01:21 +0200 [thread overview]
Message-ID: <87blcs2f9q.fsf@mail.linkov.net> (raw)
In-Reply-To: <m2czx8idvw.fsf@matts-mbp-2016.lan> (Matt Armstrong's message of "Tue, 09 Feb 2021 23:24:35 -0800")
[-- Attachment #1: Type: text/plain, Size: 1707 bytes --]
> The origin of the faces without a foreground setting is commit
> 382ceb2cdbedc06b06d9fb424d83f531339a3311 by Juri Linkov <juri@jurta.org>
> while working on https://debbugs.gnu.org/cgi/bugreport.cgi?bug=10181.
>
> I've cc'd him here. Juri, can you comment?
Thanks for pointing me at this issue since I had not realized
this is related to something affected by my previous changes.
> I'm especially interested to hear your thoughts on why the change made
> things nicer (what you said in
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=10181#84).
The core point of my 2014-year message was that with the specified foreground,
Ediff removes font-lock highlighting on non-current differences.
The need for keeping the font-lock foreground colors is evident
when looking at these font-lock colors in buffers where the effect
of font-lock is noticeable, such as changes in the source code files.
But I completely agree that the current contrast is too low on a dark theme.
Fortunately, now we have a feature that will help to fix this problem:
the face attribute :distant-foreground specifies the alternative
foreground color that is used only when the background color is too
close to the foreground color, thus making the text readable in this case.
> Or, perhaps the ediff faces should vary the background based on
> (background light) and (background dark)?
The background colors could be adjusted as well for dark backgrounds.
After changing background colors to darker colors and adding
:distant-foreground I tried different default foreground colors with
M-x set-foreground-color RET dark grey RET
and it seems everything looks readable.
Do you see more problems with the following patch?
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: ediff-dark.patch --]
[-- Type: text/x-diff, Size: 4339 bytes --]
diff --git a/lisp/vc/ediff-init.el b/lisp/vc/ediff-init.el
index 6e658163b9..3f33e6aae2 100644
--- a/lisp/vc/ediff-init.el
+++ b/lisp/vc/ediff-init.el
@@ -980,8 +980,10 @@ stipple-pixmap
(defface ediff-even-diff-A
`((((type pc))
(:foreground "green3" :background "light grey" :extend t))
- (((class color) (min-colors 88))
- (:background "light grey" :extend t))
+ (((class color) (min-colors 88) (background light))
+ (:distant-foreground "Black" :background "light grey" :extend t))
+ (((class color) (min-colors 88) (background dark))
+ (:distant-foreground "White" :background "dark grey" :extend t))
(((class color) (min-colors 16))
(:foreground "Black" :background "light grey" :extend t))
(((class color))
@@ -999,8 +1001,10 @@ ediff-even-diff-face-A
this variable represents.")
(defface ediff-even-diff-B
- `((((class color) (min-colors 88))
- (:background "Grey" :extend t))
+ `((((class color) (min-colors 88) (background light))
+ (:distant-foreground "Black" :background "Grey" :extend t))
+ (((class color) (min-colors 88) (background dark))
+ (:distant-foreground "White" :background "dim grey" :extend t))
(((class color) (min-colors 16))
(:foreground "White" :background "Grey" :extend t))
(((class color))
@@ -1019,8 +1023,10 @@ ediff-even-diff-face-B
(defface ediff-even-diff-C
`((((type pc))
(:foreground "yellow3" :background "light grey" :extend t))
- (((class color) (min-colors 88))
- (:background "light grey" :extend t))
+ (((class color) (min-colors 88) (background light))
+ (:distant-foreground "Black" :background "light grey" :extend t))
+ (((class color) (min-colors 88) (background dark))
+ (:distant-foreground "White" :background "dark grey" :extend t))
(((class color) (min-colors 16))
(:foreground "Black" :background "light grey" :extend t))
(((class color))
@@ -1040,8 +1046,10 @@ ediff-even-diff-face-C
(defface ediff-even-diff-Ancestor
`((((type pc))
(:foreground "cyan3" :background "light grey" :extend t))
- (((class color) (min-colors 88))
- (:background "Grey" :extend t))
+ (((class color) (min-colors 88) (background light))
+ (:distant-foreground "Black" :background "Grey" :extend t))
+ (((class color) (min-colors 88) (background dark))
+ (:distant-foreground "White" :background "dim grey" :extend t))
(((class color) (min-colors 16))
(:foreground "White" :background "Grey" :extend t))
(((class color))
@@ -1068,8 +1076,10 @@ ediff-even-diff-face-alist
(defface ediff-odd-diff-A
'((((type pc))
(:foreground "green3" :background "gray40" :extend t))
- (((class color) (min-colors 88))
- (:background "Grey" :extend t))
+ (((class color) (min-colors 88) (background light))
+ (:distant-foreground "Black" :background "Grey" :extend t))
+ (((class color) (min-colors 88) (background dark))
+ (:distant-foreground "White" :background "dim grey" :extend t))
(((class color) (min-colors 16))
(:foreground "White" :background "Grey" :extend t))
(((class color))
@@ -1088,8 +1098,10 @@ ediff-odd-diff-face-A
(defface ediff-odd-diff-B
'((((type pc))
(:foreground "White" :background "gray40" :extend t))
- (((class color) (min-colors 88))
- (:background "light grey" :extend t))
+ (((class color) (min-colors 88) (background light))
+ (:distant-foreground "Black" :background "light grey" :extend t))
+ (((class color) (min-colors 88) (background dark))
+ (:distant-foreground "White" :background "dark grey" :extend t))
(((class color) (min-colors 16))
(:foreground "Black" :background "light grey" :extend t))
(((class color))
@@ -1108,8 +1120,10 @@ ediff-odd-diff-face-B
(defface ediff-odd-diff-C
'((((type pc))
(:foreground "yellow3" :background "gray40" :extend t))
- (((class color) (min-colors 88))
- (:background "Grey" :extend t))
+ (((class color) (min-colors 88) (background light))
+ (:distant-foreground "Black" :background "Grey" :extend t))
+ (((class color) (min-colors 88) (background dark))
+ (:distant-foreground "White" :background "dim grey" :extend t))
(((class color) (min-colors 16))
(:foreground "White" :background "Grey" :extend t))
(((class color))
next prev parent reply other threads:[~2021-02-10 17:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-09 9:19 bug#46396: 27.1.90; Ediff's non-focused diff section, background too light in --reverse bug-gnu-emacs_at_gnu.org
2021-02-10 6:46 ` Matt Armstrong
2021-02-10 7:24 ` Matt Armstrong
2021-02-10 17:01 ` Juri Linkov [this message]
2021-02-10 18:24 ` Matt Armstrong
2021-02-10 19:39 ` Juri Linkov
2021-02-10 20:28 ` Matt Armstrong
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