[libadwaita/wip/exalm/split-hc] stylesheet: Support split buttons in HC

[Alexander Mikhaylenko <alexm src gnome org>]

commit 62f57c8ffd5ce9d5585ab43dc4aad52e47285b8f
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Mon Oct 25 18:19:46 2021 +0500

    stylesheet: Support split buttons in HC
    
    No idea how I forgot this.

 src/stylesheet/widgets/_buttons.scss | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/src/stylesheet/widgets/_buttons.scss b/src/stylesheet/widgets/_buttons.scss
index 425adf72..d3ae7b13 100644
--- a/src/stylesheet/widgets/_buttons.scss
+++ b/src/stylesheet/widgets/_buttons.scss
@@ -509,17 +509,21 @@ splitbutton {
   @at-root %flat_split_button,
   &.flat {
     > separator {
-      background: gtkalpha(currentColor, .3);
+      background: gtkalpha(currentColor, $dimmer_opacity);
     }
 
     &:hover,
     &:active,
     &:checked {
-      background: gtkalpha(currentColor, .05);
+      background: $view_hover_color;
 
       > separator {
         background: none;
       }
+
+      @if $contrast == 'high' {
+        box-shadow: inset 0 0 0 1px $thin_border_color;
+      }
     }
 
     &:focus-within:focus-visible > separator {
@@ -568,7 +572,7 @@ splitbutton {
       }
     }
 
-    $_separator_color: gtkalpha(currentColor, if($contrast == 'high', .6, .3));
+    $_separator_color: gtkalpha(currentColor, $dimmer_opacity);
     > menubutton > button {
       &:dir(ltr) { box-shadow: inset 1px 0 $_separator_color; }
       &:dir(rtl) { box-shadow: inset -1px 0 $_separator_color; }