fix(buttonGroup): fix no applying focus state to disabled button in button group telerik/kendo#7846

scss/button/_theme.scss

@@ -116,6 +116,16 @@
             box-shadow: $primary-button-focused-shadow;
         }
 
+        // Disabled state
+        &.k-state-disabled .k-button,
+        .k-state-disabled {
+
+            &:not(.k-state-active),
+            &:not(.k-state-active):hover {
+                @include fill( $button-text, $button-bg, $button-border, $button-gradient );
+            }
+        }
+
     }
 
     // Bare button