init

node_modules/ng-zorro-antd/tree-select/style/entry.less

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+@import './index.less';
+// style dependencies
+// deps-lint-skip: select
+@import '../../tree/style/entry.less';
+@import '../../select/style/entry.less';
+@import '../../empty/style/entry.less';
+@import "./patch.less";

node_modules/ng-zorro-antd/tree-select/style/index.less

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+@import '../../style/themes/index';
+@import '../../style/mixins/index';
+@import '../../tree/style/mixin';
+@import '../../checkbox/style/mixin';
+
+@tree-select-prefix-cls: ~'@{ant-prefix}-tree-select';
+@select-tree-prefix-cls: ~'@{ant-prefix}-select-tree';
+
+.antCheckboxFn(@checkbox-prefix-cls: ~'@{select-tree-prefix-cls}-checkbox');
+
+.@{tree-select-prefix-cls} {
+  // ======================= Dropdown =======================
+  &-dropdown {
+    padding: @padding-xs (@padding-xs / 2);
+
+    &-rtl {
+      direction: rtl;
+    }
+    // ======================== Tree ========================
+    .@{select-tree-prefix-cls} {
+      border-radius: 0;
+
+      &-list-holder-inner {
+        align-items: stretch;
+
+        .@{select-tree-prefix-cls}-treenode {
+          .@{select-tree-prefix-cls}-node-content-wrapper {
+            flex: auto;
+          }
+        }
+      }
+    }
+  }
+}
+
+.@{select-tree-prefix-cls} {
+  .antTreeFn(@select-tree-prefix-cls);
+
+  // change switcher icon rotation in rtl direction
+  & &-switcher {
+    &_close {
+      .@{select-tree-prefix-cls}-switcher-icon {
+        svg {
+          .@{tree-select-prefix-cls}-dropdown-rtl & {
+            transform: rotate(90deg);
+          }
+        }
+      }
+    }
+
+    &-loading-icon {
+      .@{tree-select-prefix-cls}-dropdown-rtl & {
+        transform: scaleY(-1);
+      }
+    }
+  }
+}

node_modules/ng-zorro-antd/tree-select/style/patch.less

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+.ant-tree.ant-select-tree.ant-tree-show-line nz-tree-node[builtin]:not(:last-child) > li::before {
+  position: absolute;
+  left: 12px;
+  width: 1px;
+  height: calc(100% - 16px);
+  margin: 26px 0;
+  border-left: 1px solid #d9d9d9;
+  content: ' ';
+}
+
+.ant-select-dropdown.ant-select-tree-dropdown {
+  position: relative;
+  top: 100%;
+  left: 0;
+  width: 100%;
+  margin-top: 4px;
+  margin-bottom: 4px;
+  overflow: auto;
+
+  .cdk-virtual-scroll-content-wrapper {
+    overflow: auto;
+  }
+}