fix: tree scroll

Author: ZhaoJiSen

src/app/elements/asset-tree/asset-tree.component.scss

@@ -11,13 +11,25 @@
   @content;
 }
 
+:host {
+  display: block;
+  height: 100%;
+  min-height: 0;
+  overflow: hidden;
+}
+
 .tree-container {
   display: flex;
   flex-direction: column;
   height: 100%;
+  min-height: 0;
+  overflow: hidden;
   background-color: var(--el-asset-tree-bg-color);
 
   .tree-type {
+    flex: 0 0 30px;
+    min-height: 30px;
+    overflow: hidden;
     transition: all 0.3s;
 
     .tree-type-banner {
@@ -141,9 +153,10 @@
 
     .tree-type-content {
       position: relative;
+      flex: 1 1 auto;
       padding: 1px;
-      min-height: 40px;
-      height: calc(100% - 31px);
+      min-height: 0;
+      height: auto;
       background-color: var(--el-asset-tree-bg-color);
       overflow: hidden;
       scrollbar-gutter: stable both-edges;
@@ -170,7 +183,11 @@
     }
 
     &.expand-tree {
-      height: calc(100% - 31px);
+      display: flex;
+      flex: 1 1 0;
+      flex-direction: column;
+      min-height: 0;
+      height: auto;
     }
   }
 }

src/app/elements/left-bar/left-bar.component.scss

@@ -1,10 +1,23 @@
+:host {
+  display: block;
+  height: 100%;
+  min-height: 0;
+}
+
 .sidebar {
+  display: flex;
+  flex-direction: column;
   height: 100%;
+  min-height: 0;
   width: 100%;
   overflow: hidden;
 
   .tree {
-    display: block;
+    display: flex;
+    flex: 1 1 auto;
+    flex-direction: column;
+    min-height: 0;
+    overflow: hidden;
   }
 
   .menu-icon {
@@ -22,11 +35,16 @@
 
     .menu-icon {
       display: block;
+      flex: 1 1 auto;
+      min-height: 0;
+      height: auto;
+      overflow-y: auto;
     }
   }
 
   .organization {
     display: flex;
+    flex: 0 0 30px;
     flex-direction: column;
     justify-content: center;
     height: 30px;
@@ -42,26 +60,37 @@
   }
 
   .my-assets {
-    height: calc(100vh - 61px);
+    flex: 1 1 auto;
+    min-height: 0;
+    height: auto;
+    overflow: hidden;
     color: var(--el-text-color-light);
 
-    &.has-org {
-      height: calc(100vh - 91px);
-    }
-
     .overflow {
       display: flex;
       width: 100%;
       height: 100%;
+      min-height: 0;
     }
 
     .ngx-scroll-overlay {
-      overflow: auto; // for FF
+      // The tree content owns vertical scrolling. A scrollable wrapper here
+      // creates a second scrollbar when more tree sections are added.
+      overflow: hidden;
+    }
+
+    elements-asset-tree {
+      display: block;
+      flex: 1 1 auto;
+      min-height: 0;
+      height: 100%;
+      overflow: hidden;
     }
   }
 
   .footer-version {
     display: flex;
+    flex: 0 0 30px;
     align-items: center;
     line-height: 30px;
     font-size: 9pt;