* picker: optimize style in checkable mode.

src/js/picker.js

@@ -342,7 +342,7 @@
                 if (that.disabled) {
                     return;
                 }
-                if (that.dropListShowed) {
+                if (that.dropListShowed && !options.checkable) {
                     e.preventDefault();
                     e.stopPropagation();
                     return;
@@ -351,7 +351,7 @@
                 if (that.disabled) {
                     return;
                 }
-                if (!$selections.hasClass('sortable-sorting') && !$(e.target).closest('.picker-selection-remove').length && !that.dropListShowed) {
+                if (!$selections.hasClass('sortable-sorting') && !$(e.target).closest('.picker-selection-remove').length && (!that.dropListShowed || options.checkable)) {
                     that.focus();
                 }
             });

src/less/components/picker.less

@@ -346,4 +346,11 @@
             background-color: @color-pale!important;
         }
     }
+    .picker-option-active .picker-option-text-matched,
+    .picker-option:hover .picker-option-text-matched {
+        color: @color-primary!important;
+        &:before {
+            background: @color-primary!important;
+        }
+    }
 }