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F4SDwebService/packages/popper.js.1.16.1/content/Scripts/src/utils/findCommonOffsetParent.js

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+import isOffsetContainer from './isOffsetContainer';
+import getRoot from './getRoot';
+import getOffsetParent from './getOffsetParent';
+
+/**
+ * Finds the offset parent common to the two provided nodes
+ * @method
+ * @memberof Popper.Utils
+ * @argument {Element} element1
+ * @argument {Element} element2
+ * @returns {Element} common offset parent
+ */
+export default function findCommonOffsetParent(element1, element2) {
+  // This check is needed to avoid errors in case one of the elements isn't defined for any reason
+  if (!element1 || !element1.nodeType || !element2 || !element2.nodeType) {
+    return document.documentElement;
+  }
+
+  // Here we make sure to give as "start" the element that comes first in the DOM
+  const order =
+    element1.compareDocumentPosition(element2) &
+    Node.DOCUMENT_POSITION_FOLLOWING;
+  const start = order ? element1 : element2;
+  const end = order ? element2 : element1;
+
+  // Get common ancestor container
+  const range = document.createRange();
+  range.setStart(start, 0);
+  range.setEnd(end, 0);
+  const { commonAncestorContainer } = range;
+
+  // Both nodes are inside #document
+  if (
+    (element1 !== commonAncestorContainer &&
+      element2 !== commonAncestorContainer) ||
+    start.contains(end)
+  ) {
+    if (isOffsetContainer(commonAncestorContainer)) {
+      return commonAncestorContainer;
+    }
+
+    return getOffsetParent(commonAncestorContainer);
+  }
+
+  // one of the nodes is inside shadowDOM, find which one
+  const element1root = getRoot(element1);
+  if (element1root.host) {
+    return findCommonOffsetParent(element1root.host, element2);
+  } else {
+    return findCommonOffsetParent(element1, getRoot(element2).host);
+  }
+}