[libadwaita] stylesheet: Add hover style to activatable gridview children

[Alexander Mikhaylenko <alexm src gnome org>]

commit aecac6b08b8ad8d6d6b28d9570b2cb6f3c224c74
Author: Romain Vigier <romain romainvigier fr>
Date:   Thu Dec 9 11:43:03 2021 +0100

    stylesheet: Add hover style to activatable gridview children
    
    Make the GtkGridView children consistent with the GtkListView
    rows by having a hover style when they are activatable.

 src/stylesheet/widgets/_views.scss | 12 ++++++++++++
 1 file changed, 12 insertions(+)
---
diff --git a/src/stylesheet/widgets/_views.scss b/src/stylesheet/widgets/_views.scss
index 567e5860..a6e67e77 100644
--- a/src/stylesheet/widgets/_views.scss
+++ b/src/stylesheet/widgets/_views.scss
@@ -66,3 +66,15 @@ gridview > child {
     background-color: $view_selected_color;
   }
 }
+
+gridview > child.activatable {
+  &:hover { background-color: $view_hover_color; }
+
+  &:active { background-color: $view_active_color; }
+
+  &:selected {
+    &:hover { background-color: $view_selected_hover_color; }
+
+    &:active { background-color: $view_selected_active_color; }
+  }
+}