fix: iOS Autocorrect strips formatting by reporting wrong dataType

packages/lexical-clipboard/src/clipboard.ts

@@ -148,7 +148,12 @@ export function $insertDataTransferForRichText(
   }
 
   const htmlString = dataTransfer.getData('text/html');
-  if (htmlString) {
+  const plainString = dataTransfer.getData('text/plain');
+
+  // Skip HTML handling if it matches the plain text representation.
+  // This avoids unnecessary processing for plain text strings created by
+  // iOS Safari autocorrect, which incorrectly includes a `text/html` type.
+  if (htmlString && plainString !== htmlString) {
     try {
       const parser = new DOMParser();
       const dom = parser.parseFromString(
@@ -165,8 +170,7 @@ export function $insertDataTransferForRichText(
   // Multi-line plain text in rich text mode pasted as separate paragraphs
   // instead of single paragraph with linebreaks.
   // Webkit-specific: Supports read 'text/uri-list' in clipboard.
-  const text =
-    dataTransfer.getData('text/plain') || dataTransfer.getData('text/uri-list');
+  const text = plainString || dataTransfer.getData('text/uri-list');
   if (text != null) {
     if ($isRangeSelection(selection)) {
       const parts = text.split(/(\r?\n|\t)/);

packages/lexical/src/__tests__/unit/HTMLCopyAndPaste.test.ts

@@ -7,6 +7,7 @@
  */
 
 import {$insertDataTransferForRichText} from '@lexical/clipboard';
+import {$patchStyleText} from '@lexical/selection';
 import {
   $createParagraphNode,
   $getRoot,
@@ -110,6 +111,35 @@ describe('HTMLCopyAndPaste tests', () => {
           expect(testEnv.innerHTML).toBe(testCase.expectedHTML);
         });
       });
+
+      test('iOS fix: Word predictions should be handled as plain text to maintain selection formatting', async () => {
+        const {editor} = testEnv;
+
+        const dataTransfer = new DataTransferMock();
+
+        // we simulate choosing an iOS Safari `autocorrect` or `word prediction`
+        // which pastes the word into the editor with both the `text/plain` and `text/html` data types
+        dataTransfer.setData('text/plain', 'Prediction');
+        dataTransfer.setData('text/html', 'Prediction');
+
+        // to compensate, the clipboard content will only be inserted as HTML if the `text/html` content differs from the `text/plain` content
+        await editor.update(() => {
+          const selection = $getSelection();
+          invariant(
+            $isRangeSelection(selection),
+            'isRangeSelection(selection)',
+          );
+          $patchStyleText(selection, {
+            'background-color': 'rgb(255,170,45)',
+          });
+          $insertDataTransferForRichText(dataTransfer, selection, editor);
+        });
+
+        // the editor's selection formatting is maintained because the text has been inserted as plain text
+        expect(testEnv.innerHTML).toBe(
+          '<p dir="ltr"><span style="background-color: rgb(255, 170, 45);" data-lexical-text="true">Prediction</span></p>',
+        );
+      });
     },
     {
       namespace: 'test',