refactor: tree菜单位置飘移优化

frontend/src/components/widget/DeWidget/DeSelectGrid.vue

@@ -228,10 +228,12 @@ export default {
     padding:0 8px;
   }
   .father .child {
-    display: none;
+    /*display: none;*/
+    visibility: hidden;
   }
   .father:hover .child {
-    display: inline;
+    /*display: inline;*/
+    visibility: visible;
   }
 .de-filter-tree {
   >>>span.is-leaf {

frontend/src/views/chart/group/Group.vue

@@ -1048,10 +1048,12 @@ export default {
     text-overflow: ellipsis;
   }
   .father .child {
-    display: none;
+    /*display: none;*/
+    visibility: hidden;
   }
   .father:hover .child {
-    display: inline;
+    /*display: inline;*/
+    visibility: visible;
   }
   .tree-style {
     padding: 10px 15px;

frontend/src/views/dataset/group/Group.vue

@@ -989,10 +989,12 @@ export default {
     text-overflow: ellipsis;
   }
   .father .child {
-    display: none;
+    /*display: none;*/
+    visibility: hidden;
   }
   .father:hover .child {
-    display: inline;
+    /*display: inline;*/
+    visibility: visible;
   }
 
   .dialog-css >>> .el-dialog__body {

frontend/src/views/panel/list/PanelList.vue

@@ -647,10 +647,12 @@ export default {
   }
 
   .father .child {
-    display: none;
+    /*display: none;*/
+    visibility: hidden;
   }
   .father:hover .child {
-    display: inline;
+    /*display: inline;*/
+    visibility: visible;
   }
 
 </style>

frontend/src/views/system/datasource/DsTree.vue

@@ -298,10 +298,12 @@ export default {
     text-overflow: ellipsis;
   }
   .father .child {
-    display: none;
+    /*display: none;*/
+    visibility: hidden;
   }
   .father:hover .child {
-    display: inline;
+    /*display: inline;*/
+    visibility: visible;
   }
   .tree-style {
     padding: 10px 15px;