[libadwaita/wip/exalm/background-colors: 40/54] stylesheet: Remove unused mixins

[Alexander Mikhaylenko <alexm src gnome org>]

commit 9c58572da17787099d19c1ca771d6f0279e583a6
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed Sep 1 13:51:01 2021 +0500

    stylesheet: Remove unused mixins

 src/stylesheet/_drawing.scss | 22 ----------------------
 1 file changed, 22 deletions(-)
---
diff --git a/src/stylesheet/_drawing.scss b/src/stylesheet/_drawing.scss
index c22ec9bc..c4f9612c 100644
--- a/src/stylesheet/_drawing.scss
+++ b/src/stylesheet/_drawing.scss
@@ -25,21 +25,6 @@
   }
 }
 
-@mixin _shadows($list...) {
-//
-// Helper mixin to stack up to box-shadows;
-//
-  $shadows: null;
-
-  @each $shadow in $list {
-    @if $shadow!=none { $shadows: $shadows, $shadow; }
-  }
-
-  box-shadow: $shadows;
-}
-
-// entries
-
 @mixin entry($t, $fc:$focus_border_color) {
 //
 // Entries drawing function
@@ -79,13 +64,6 @@
   }
 }
 
-// buttons
-
-@function _border_color($c, $darker: false) {
-  @if $darker == true { @return darken($c, 20%); }
-  @else { @return darken($c, 15%); }
-}
-
 @mixin overshoot($p) {
 //
 // overshoot