fix(collapse-panel): expandIcon does not take effect (#3093)

* fix(collapse-panel): expandIcon does not take effect

* fix(Collapse): 支持动态设置disabled

---------

Co-authored-by: jarmywang <awangjianjun9@gmail.com>

src/collapse-panel/collapse-panel.ts

@@ -23,7 +23,7 @@ export default class CollapsePanel extends SuperComponent {
         const { value, expandIcon, disabled } = target.properties;
 
         this.setData({
-          ultimateExpandIcon: expandIcon || this.properties.expandIcon,
+          ultimateExpandIcon: this.properties.expandIcon == null ? expandIcon : this.properties.expandIcon,
           ultimateDisabled: this.properties.disabled == null ? disabled : this.properties.disabled,
         });
 
@@ -43,6 +43,12 @@ export default class CollapsePanel extends SuperComponent {
     ultimateDisabled: false,
   };
 
+  observers = {
+    disabled(v) {
+      this.setData({ ultimateDisabled: !!v });
+    },
+  };
+
   methods = {
     updateExpanded(activeValues = []) {
       if (!this.$parent || this.data.ultimateDisabled) {