[lexical-link] Feature: Merging two identical links into one node

packages/lexical-clipboard/src/clipboard.ts

@@ -225,15 +225,62 @@ export function $insertGeneratedNodes(
   nodes: Array<LexicalNode>,
   selection: BaseSelection,
 ): void {
+  // If the selection is entirely within a link,
+  // we want to insert the text content of the nodes into the link
+  function isSameLinkParent(sel: BaseSelection): boolean {
+    const points = sel.getStartEndPoints();
+    if (points == null) {
+      return false;
+    }
+
+    const startPoint = points[0];
+    const endPoint = points[1];
+
+    if (startPoint == null || endPoint == null) {
+      return false;
+    }
+
+    const startNode = startPoint.getNode();
+    const endNode = endPoint.getNode();
+
+    if (startNode == null || endNode == null) {
+      return false;
+    }
+
+    const parentElementBefore = startNode.getParent();
+    const parentElementAfter = endNode.getParent();
+
+    if (parentElementBefore == null || parentElementAfter == null) {
+      return false;
+    }
+
+    return (
+      parentElementAfter.getType() === 'link' &&
+      parentElementAfter.getType() === parentElementBefore.getType()
+    );
+  }
+
   if (
     !editor.dispatchCommand(SELECTION_INSERT_CLIPBOARD_NODES_COMMAND, {
       nodes,
       selection,
     })
   ) {
-    selection.insertNodes(nodes);
-    $updateSelectionOnInsert(selection);
+    if (isSameLinkParent(selection)) {
+      // Only insert the content of the first text node
+      const textNodes = nodes.filter((node) => $isTextNode(node));
+
+      if (textNodes.length > 0) {
+        const firstText = textNodes[0];
+        selection.insertText(firstText.getTextContent());
+        $updateSelectionOnInsert(selection);
+      }
+    } else {
+      selection.insertNodes(nodes);
+      $updateSelectionOnInsert(selection);
+    }
   }
+
   return;
 }