fix(FilteredActionList): prevent content-visibility from clipping item dividers

.changeset/fix-select-panel-item-dividers.md

@@ -0,0 +1,5 @@
+---
+'@primer/react': patch
+---
+
+Fix item dividers not visible in SelectPanel and FilteredActionList when `showItemDividers` is enabled, caused by `content-visibility: auto` clipping the absolutely-positioned divider pseudo-elements.

packages/react/src/FilteredActionList/FilteredActionList.module.css

@@ -23,6 +23,13 @@
     content-visibility: auto;
     contain-intrinsic-size: auto 32px;
   }
+
+  /* When showDividers is enabled, divider ::before pseudo-elements on ActionListSubContent are
+     positioned outside the item bounds (top: -7px). content-visibility: auto applies paint containment
+     which clips these, so we must disable it for items in lists with dividers. */
+  & [data-dividers='true'] .ActionListItem {
+    content-visibility: visible;
+  }
 }
 
 .ActionList {