Support inactive buttongroup items

Change-Id: I7939a0554301656ad4df56a17143704dc3cbe5b4
diff --git a/dev/scss/base/buttongroup.scss b/dev/scss/base/buttongroup.scss
index 42dfbdb..1937e53 100644
--- a/dev/scss/base/buttongroup.scss
+++ b/dev/scss/base/buttongroup.scss
@@ -25,7 +25,7 @@
       border-style: solid;
       border-width: $border-size 0;
 
-      &:hover {
+      &:not(.inactive):hover {
 	@include choose-hover;
         transition: none;
       }