Keep parent popovers open when a nested one opens

Opening a popover, dropdown menu, select or combobox closed every
other open one, including the popover it sits in. Only close the
ones that don't contain the source, like native popover=auto.

src/js/combobox.js

@@ -503,7 +503,7 @@
       if (!root.contains(event.target)) root.close(false);
     };
     const handleDocumentPopover = (event) => {
-      if (event.detail.source !== root) root.close(false);
+      if (!root.contains(event.detail.source)) root.close(false);
     };
 
     state.input.addEventListener('focus', handleInputFocus);

src/js/dropdown-menu.js

@@ -165,7 +165,7 @@
     };
 
     const handleDocumentPopover = (event) => {
-      if (event.detail.source !== root) root.close(false);
+      if (!root.contains(event.detail.source)) root.close(false);
     };
 
     state.trigger.addEventListener('click', handleTriggerClick);

src/js/popover.js

@@ -60,7 +60,7 @@
     };
 
     const handleDocumentPopover = (event) => {
-      if (event.detail.source !== popoverComponent) {
+      if (!popoverComponent.contains(event.detail.source)) {
         closePopover(false);
       }
     };

src/js/select.js

@@ -373,7 +373,7 @@
       if (!root.contains(event.target)) root.close(false);
     };
     const handleDocumentPopover = (event) => {
-      if (event.detail.source !== root) root.close(false);
+      if (!root.contains(event.detail.source)) root.close(false);
     };
 
     state.trigger.addEventListener('keydown', handleTriggerKeydown);