fix(portable-text-editor): fix and test issue with merge block operat…

…ion (#5996)

* test(portable-text-editor): fix wrong path used in package script (dev)

* test(portable-text-editor): fix debug statement and remove redundant var

* test(portable-text-editr): add collab test for merge empty block

packages/@sanity/portable-text-editor/e2e-tests/__tests__/writingTogether.collaborative.test.ts

@@ -65,6 +65,67 @@ describe('collaborate editing', () => {
     })
   })
 
+  it('should not remove content for both users if one user backspaces into a block that starts with a mark.', async () => {
+    const exampleValue = [
+      {
+        _key: 'randomKey0',
+        _type: 'block',
+        children: [
+          {
+            _key: 'randomKey1',
+            _type: 'span',
+            marks: ['strong'],
+            text: 'Example Text: ',
+          },
+          {
+            _type: 'span',
+            marks: [],
+            text: "This is a very long example text that will completely disappear later on. It's kind of a bad magic trick, really. Just writing more text so the disappearance becomes more apparent. This is a very long example text that will completely disappear later on. It's kind of a bad magic trick, really. Just writing more text so the disappearance becomes more apparent. This is a very long example text that will completely disappear later on. It's kind of a bad magic trick, really. Just writing more text so the disappearance becomes more apparent.",
+            _key: 'randomKey2',
+          },
+        ],
+        markDefs: [],
+        style: 'normal',
+      },
+    ]
+    await setDocumentValue(exampleValue)
+    const [editorA, editorB] = await getEditors()
+    await editorA.setSelection({
+      anchor: {path: [{_key: 'randomKey0'}, 'children', {_key: 'randomKey2'}], offset: 542},
+      focus: {path: [{_key: 'randomKey0'}, 'children', {_key: 'randomKey2'}], offset: 542},
+    })
+    await editorA.pressKey('Enter')
+    await editorA.pressKey('Backspace')
+
+    await new Promise((resolve) => setTimeout(resolve, 1000))
+
+    const valA = await editorA.getValue()
+    const valB = await editorB.getValue()
+    expect(valA).toEqual(valB)
+    expect(valB).toEqual([
+      {
+        _key: 'randomKey0',
+        _type: 'block',
+        children: [
+          {
+            _key: 'randomKey1',
+            _type: 'span',
+            marks: ['strong'],
+            text: 'Example Text: ',
+          },
+          {
+            _type: 'span',
+            marks: [],
+            text: "This is a very long example text that will completely disappear later on. It's kind of a bad magic trick, really. Just writing more text so the disappearance becomes more apparent. This is a very long example text that will completely disappear later on. It's kind of a bad magic trick, really. Just writing more text so the disappearance becomes more apparent. This is a very long example text that will completely disappear later on. It's kind of a bad magic trick, really. Just writing more text so the disappearance becomes more apparent.",
+            _key: 'randomKey2',
+          },
+        ],
+        markDefs: [],
+        style: 'normal',
+      },
+    ])
+  })
+
   it('will reset the value when someone deletes everything, and when they start to type again, they will produce their own respective blocks.', async () => {
     await setDocumentValue(initialValue)
     const [editorA, editorB] = await getEditors()

packages/@sanity/portable-text-editor/package.json

@@ -57,7 +57,7 @@
     "clean": "rimraf lib",
     "lint": "eslint .",
     "prettier": "prettier --write './**/*.{ts,tsx,js,css,html}'",
-    "dev": "cd ./test/ && ts-node serve",
+    "dev": "cd ./e2e-tests/ && ts-node serve",
     "test": "jest",
     "test:e2e": "jest --config=e2e-tests/e2e.config.cjs",
     "test:watch": "jest --watch",

packages/@sanity/portable-text-editor/src/utils/applyPatch.ts

@@ -250,18 +250,22 @@ function setPatch(editor: PortableTextSlateEditor, patch: SetPatch) {
   } else if (Element.isElement(block) && patch.path.length === 1 && blockPath) {
     debug('Setting block property')
     const {children, ...nextRest} = value as unknown as PortableTextBlock
-    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars, unused-imports/no-unused-vars
     const {children: prevChildren, ...prevRest} = block || {children: undefined}
+    // Set any block properties
     editor.apply({
       type: 'set_node',
       path: blockPath,
       properties: {...prevRest},
       newProperties: nextRest,
     })
+    // Replace the children in the block
+    // Note that children must be explicitly inserted, and can't be set with set_node
+    debug('Setting children')
     block.children.forEach((c, cIndex) => {
       editor.apply({
         type: 'remove_node',
-        path: blockPath.concat(cIndex),
+        path: blockPath.concat(block.children.length - 1 - cIndex),
         node: c,
       })
     })
@@ -306,6 +310,7 @@ function unsetPatch(editor: PortableTextSlateEditor, patch: UnsetPatch, previous
     return true
   }
   const {block, blockPath, child, childPath} = findBlockAndChildFromPath(editor, patch.path)
+
   // Single blocks
   if (patch.path.length === 1) {
     if (!block || !blockPath) {
@@ -327,11 +332,10 @@ function unsetPatch(editor: PortableTextSlateEditor, patch: UnsetPatch, previous
       debug('Child not found')
       return false
     }
-    const childIndex = childPath[1]
     debug(`Unsetting child at path ${JSON.stringify(childPath)}`)
     debugState(editor, 'before')
     if (debugVerbose) {
-      debug(`Removing child at path ${JSON.stringify([childPath, childIndex])}`)
+      debug(`Removing child at path ${JSON.stringify(childPath)}`)
     }
     Transforms.removeNodes(editor, {at: childPath})
     debugState(editor, 'after')