Merge pull request #229 in YR/star-web-components from dock to master

* commit '69686ed3488c83c833b0bf456bec8b0e75d5244a':
  BUG: #154710 - 解决Dock栏因为受主屏容器图标折返拖拽动作的影响，导致最右图标消失问题

src/components/dock/dock.ts

@@ -627,6 +627,7 @@ export default class StarDock extends StarBaseElement {
       this._dnd.child.container.classList.remove('dragging')
     }
 
+    this._dragChild = undefined
     this.synchronise()
   }
 

src/components/grid-container/container.ts

@@ -2527,7 +2527,7 @@ export class GaiaContainer extends StarBaseElement {
 
       const elementHeight = this._dnd.child.element.offsetHeight
       const elementWidth = this._dnd.child.element.offsetWidth
-      if (centerY > this.offsetHeight) {
+      if (centerY > this.offsetHeight + this.top) {
         this.dragPosition = 'outter'
         if (!this.throttle) {
           this.throttle = window.setTimeout(() => {