[nautilus/wip/antoniof/gnome-42-highcontrast: 8/8] css: Add backdrop style for pathbar

[António Fernandes <antoniof src gnome org>]

commit c37dc7cfdfb9a483989001cf67903ca658a6829c
Author: António Fernandes <antoniof gnome org>
Date:   Wed Mar 16 19:47:37 2022 +0000

    css: Add backdrop style for pathbar
    
    The difference between @borders and @unfocused_borders colors is barely
    noticeable with the regular stylesheet, but marked with high contrast.

 src/resources/css/Adwaita.css | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/src/resources/css/Adwaita.css b/src/resources/css/Adwaita.css
index f96cddc19..f38923d9d 100644
--- a/src/resources/css/Adwaita.css
+++ b/src/resources/css/Adwaita.css
@@ -64,6 +64,12 @@
   border-right-width: 0px;
   background-color: @theme_bg_color;
 }
+
+.nautilus-path-bar scrolledwindow:backdrop {
+  background-color: @theme_unfocused_bg_color;
+  border-color: @unfocused_borders;
+}
+
 .nautilus-path-bar scrolledwindow undershoot.left {
   border-radius: 5px 0px 0px 5px;
   background: linear-gradient(to right, @theme_bg_color 6px, alpha(@theme_bg_color, 0) 24px);