fix: flex divided list item shrink (#38255)

don't make the items shrink since they are used as list items.

fix #38220

web_src/css/shared/flex-list.css

@@ -20,10 +20,12 @@
 
 .flex-divided-list > .item {
   padding: 10px 0;
+  flex-shrink: 0;
 }
 
 .flex-divided-list > .divider {
   margin: 0;
+  flex-shrink: 0;
 }
 
 .flex-divided-list > .item + .item {