无JIRA singletree.combo 支持传入popup属性, maxHeight之类的

packages/fineui/src/widget/singletree/singletree.combo.js

@@ -33,6 +33,7 @@ export class SingleTreeCombo extends Widget {
             items: [],
             value: "",
             allowClear: false,
+            popup: {}
         });
     }
 
@@ -77,6 +78,7 @@ export class SingleTreeCombo extends Widget {
             el: this.trigger,
             popup: {
                 el: this.popup,
+                ...o.popup
             },
         });