fix zindex on tab panels since we don't set display none

Author: jogibear9988

lib/es5/dock-spawn-ts.js

@@ -1,6 +1,6 @@
 {
   "name": "dock-spawn-ts",
-  "version": "3.11.1",
+  "version": "3.11.2",
   "description": "DockSpawn Typescript Version",
   "license": "MIT",
   "author": "jochen.kuehner@gmx.de",

lib/js/TabPage.js

@@ -49,6 +49,7 @@ export class TabPage {
         this.handle.destroy();
 
         if (this.container instanceof PanelContainer) {
+            this.container.elementContentContainer.style.zIndex = '';
             let panel = this.container;
             delete panel.onTitleChanged;
         }
@@ -73,6 +74,13 @@ export class TabPage {
         this.selected = flag;
         this.handle.setSelected(flag);
 
+        if (this.container instanceof PanelContainer) {
+            if (flag)
+                this.container.elementContentContainer.style.zIndex = '1';
+            else
+                this.container.elementContentContainer.style.zIndex = '';
+        }
+
         if (!this._initContent)
             this.host.contentElement.appendChild(this.containerElement);
         this._initContent = true;