[gtk/wip/exalm/window-shadow-dark-4] Adwaita: Use transparent black for window border in dark too

[Alexander Mikhaylenko <alexm src gnome org>]

commit 0942e863f276b9c542aacb28375a686c50d2b944
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Fri Mar 5 22:59:25 2021 +0500

    Adwaita: Use transparent black for window border in dark too
    
    Avoid smear when the background behind the window is dark. Adjust opacity
    to make it appear roughly the same as before on white background.

 gtk/theme/Adwaita/_common.scss | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index ca35ea7b30..c5baa58518 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -1821,7 +1821,7 @@ popover.background {
 
   > arrow,
   > contents {
-    $_popover_border: if($variant=='light', transparentize(black, 0.77), transparentize($borders_color, 
0.1));
+    $_popover_border: if($variant=='light', transparentize(black, 0.77), transparentize(black, 0.25));
 
     background-color: $menu_color;
     background-clip: padding-box;
@@ -4043,8 +4043,8 @@ window {
 
   // this needs to be transparent
   // see bug #722563
-  $_wm_border: if($variant=='light', transparentize(black, 0.77), transparentize($borders_color, 0.1));
-  $_wm_border_backdrop: if($variant=='light', transparentize(black, 0.82), transparentize($borders_color, 
0.1));
+  $_wm_border: if($variant=='light', transparentize(black, 0.77), transparentize(black, 0.25));
+  $_wm_border_backdrop: if($variant=='light', transparentize(black, 0.82), transparentize(black, 0.25));
 
   &.csd {
     box-shadow: 0 3px 9px 1px transparentize(black, 0.5),