[gtk] Adwaita: use borders_color for separators - fixes #2175

[Sam Hewitt <snwh src gnome org>]

commit 023bb2c9846d909ca7967143ba1d3cf10eaa3bf5
Author: Sam Hewitt <sam snwh org>
Date:   Mon Oct 7 13:05:12 2019 -0400

    Adwaita: use borders_color for separators
     - fixes #2175

 gtk/theme/Adwaita/_common.scss           | 2 +-
 gtk/theme/Adwaita/gtk-contained-dark.css | 2 +-
 gtk/theme/Adwaita/gtk-contained.css      | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 34df3ba88c..53848c57e3 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -3729,7 +3729,7 @@ scrolledwindow {
 
 //vbox and hbox separators
 separator {
-  background: transparentize(black, 0.9);
+  background: lighten($borders_color, 5%);
   min-width: 1px;
   min-height: 1px;
 }
diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index df397d8e11..68a2bb3121 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -1616,7 +1616,7 @@ scrolledwindow junction:dir(rtl) { border-image-slice: 0 1 0 0; }
 
 scrolledwindow junction:backdrop { border-image-source: linear-gradient(to bottom, #202020 1px, transparent 
1px); background-color: #2d2d2d; transition: 200ms ease-out; }
 
-separator { background: rgba(0, 0, 0, 0.1); min-width: 1px; min-height: 1px; }
+separator { background: #282828; min-width: 1px; min-height: 1px; }
 
 /********* Lists * */
 list { color: white; background-color: #2d2d2d; border-color: #1b1b1b; }
diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index 83e2258bd9..8cf964923e 100644
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -1632,7 +1632,7 @@ scrolledwindow junction:dir(rtl) { border-image-slice: 0 1 0 0; }
 
 scrolledwindow junction:backdrop { border-image-source: linear-gradient(to bottom, #d5d0cc 1px, transparent 
1px); background-color: #efedec; transition: 200ms ease-out; }
 
-separator { background: rgba(0, 0, 0, 0.1); min-width: 1px; min-height: 1px; }
+separator { background: #d8d4d0; min-width: 1px; min-height: 1px; }
 
 /********* Lists * */
 list { color: black; background-color: #ffffff; border-color: #cdc7c2; }