[gtk/wip/jimmac/flat-buttons] Adwaita: fine tune flat button styling

[Jakub Steiner <jimmac src gnome org>]

commit 0cda6f42b8e2a8bf60b4f890264552e3247b68ee
Author: Jakub Steiner <jimmac gmail com>
Date:   Thu Jan 7 12:12:55 2021 +0100

    Adwaita: fine tune flat button styling
    
    - enough contrast for hover and active, while noticably different in
      normal nad headerbar context (and both light and dark variants).
    
    Fixes https://gitlab.gnome.org/GNOME/gtk/-/issues/3481

 gtk/theme/Adwaita/_common.scss  | 2 +-
 gtk/theme/Adwaita/_drawing.scss | 5 ++---
 2 files changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index f5963fcba9..625744278c 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -1397,7 +1397,7 @@ windowcontrols {
     min-height: 0;
     &:hover {
       //special case hover colors inside a headerbar
-      @include button(undecorated-hover,$c:darken($headerbar_bg_color,10%));
+      @include button(undecorated-hover,$c:darken($headerbar_bg_color,6%));
     }
     &:active,
     &:checked { @include button(undecorated-active,$c:darken($headerbar_bg_color,10%)); }
diff --git a/gtk/theme/Adwaita/_drawing.scss b/gtk/theme/Adwaita/_drawing.scss
index aca1fa8651..87dcad9130 100644
--- a/gtk/theme/Adwaita/_drawing.scss
+++ b/gtk/theme/Adwaita/_drawing.scss
@@ -420,9 +420,8 @@
     text-shadow: none;
     @if $variant == 'light' {
       background-color: darken($c,14%);
-    }
-    @else {
-      background-color: darken($c,10%);
+    } @else {
+      background-color: darken($c,1%);
     }
   }
   @else if $t==undecorated-active {