FIX: select-kit refactoring

- improve mini-tag-chooser keyboard behavior
- all multil select now respond to select all and left/right arrows
- improve events handling
- many minor tweaks

app/assets/javascripts/select-kit/components/topic-footer-mobile-dropdown.js.es6

@@ -8,7 +8,7 @@ export default ComboBoxComponent.extend({
   allowInitialValueMutation: false,
 
   computeHeaderContent() {
-    let content = this.baseHeaderComputedContent();
+    let content = this._super();
     content.name = I18n.t("topic.controls");
     return content;
   },
@@ -45,7 +45,7 @@ export default ComboBoxComponent.extend({
       return;
     }
 
-    const refresh = () => this.send("deselect", value);
+    const refresh = () => this.deselect(this.get("selection"));
 
     switch(value) {
       case "invite":