Don't deselect radio buttons in data-toggle; fixes #9920

Merges #10787

js/button.js

@@ -54,15 +54,21 @@
 
   Button.prototype.toggle = function () {
     var $parent = this.$element.closest('[data-toggle="buttons"]')
+    var changed = true
 
     if ($parent.length) {
       var $input = this.$element.find('input')
-        .prop('checked', !this.$element.hasClass('active'))
-        .trigger('change')
-      if ($input.prop('type') === 'radio') $parent.find('.active').removeClass('active')
+      if ($input.prop('type') === 'radio') {
+        // see if clicking on current one
+        if ($input.prop('checked') && this.$element.hasClass('active'))
+          changed = false
+        else
+          $parent.find('.active').removeClass('active')
+      }
+      if (changed) $input.prop('checked', !this.$element.hasClass('active')).trigger('change')
     }
 
-    this.$element.toggleClass('active')
+    if (changed) this.$element.toggleClass('active')
   }