fix(buttonGroupd): add focus state to button in disabled button group telerik/kendo#7846

scss/button/_layout.scss

@@ -143,6 +143,11 @@
             z-index: 2;
         }
 
+        &.k-state-disabled .k-button,
+        .k-state-disabled {
+            pointer-events: auto;
+        }
+
         .k-group-start,
         .k-item:first-child .k-button {
             @include border-left-radius();

scss/button/_theme.scss

@@ -105,12 +105,22 @@
 
         // Selected hover state
         .k-button:active:hover,
-        .k-button.k-state-active:hover
+        .k-button.k-state-active:hover,
         > input[type="radio"]:hover + .k-button,
         > input[type="checkbox"]:hover + .k-button {
             @include fill( $selected-text, $selected-bg, $selected-border, none );
         }
 
+        // 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 );
+            }
+        }
+
     }
 
     //SplitButton