[libadwaita/wip/exalm/backdrop: 15/27] stylesheet: Drop unused backdrop check styles

[Alexander Mikhaylenko <alexm src gnome org>]

commit f05331d681afb5ee1f54d079ac36fa92b39207b6
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Fri Apr 30 00:53:32 2021 +0500

    stylesheet: Drop unused backdrop check styles

 src/stylesheet/_drawing.scss | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)
---
diff --git a/src/stylesheet/_drawing.scss b/src/stylesheet/_drawing.scss
index 1bb0031..38f1585 100644
--- a/src/stylesheet/_drawing.scss
+++ b/src/stylesheet/_drawing.scss
@@ -409,7 +409,7 @@ $_default_button_c: lighten($bg_color,2%);
   // $checked:  bool to chose between checked/unchecked
   //
   // possible $t values:
-  // normal, hover, active, insensitive, backdrop, backdrop-insensitive, menu
+  // normal, hover, active, insensitive, menu
 
   $_border_color: if($c==$checkradio_bg_color, $checkradio_borders_color, $alt_borders_color);
   $_dim_border_color: transparentize($_border_color, if($variant == 'light', 0.3, 0.7));
@@ -436,17 +436,6 @@ $_default_button_c: lighten($bg_color,2%);
     color: transparentize($tc, 0.3);
   }
 
-  @if $t==backdrop {
-    background-image: image($c);
-    box-shadow: none;
-    color: $tc;
-  }
-
-  @if $t==backdrop-insensitive {
-    box-shadow: none;
-    color: transparentize($tc, 0.3);
-  }
-
   @if $t==menu {
    transform: scale(0.8);
    border-width: 1.2px;