fix(abc:st): fix shadow spacing in truncate (#1558)

Author: cipchk

packages/abc/st/st.component.html

@@ -67,6 +67,7 @@
           [nzLeft]="_c._left!"
           [nzRight]="_c._right!"
           [ngClass]="_c.className!"
+          [class.text-truncate]="_c._isTruncate"
           [attr.data-col]="_c.indexKey"
           [attr.data-col-index]="index"
           [nzShowSort]="_c._sort.enabled"

packages/abc/st/style/index.less

@@ -139,8 +139,10 @@
       }
     }
   }
-  // 修复无法显示阴影问题
-  .@{ant-prefix}-table {
+  // 若 `widthMode` 为 `truncate` 会导致固定列的阴影失效，其他情况不存在此情况
+  // 这里使用 `text-truncate` 来区分
+  // https://github.com/ng-alain/ng-alain/issues/2336
+  .text-truncate.@{ant-prefix}-table {
     &-cell-fix-left-first::after,
     &-cell-fix-left-last::after {
       transform: translateX(80%);

packages/abc/st/test/st.spec.ts

@@ -1444,7 +1444,7 @@ describe('abc: st', () => {
             .cd()
             .updateColumn([{ title: '', index: 'id', width: 50, className: 'aaaa' }])
             .expectElCount(`.st__width-strict`, 1)
-            .expectElCount(`.text-truncate`, context.comp._data.length)
+            .expectElCount(`td.text-truncate`, context.comp._data.length)
             .expectElCount(`td.aaaa`, context.comp._data.length)
             .asyncEnd();
         }));