Preserve linked resources when pasting prompts (#8972)

* fix(app): preserve linked resources when pasting prompts

Rich clipboard links carried their destination only in HTML, while the composer let textarea default paste insert the plain label. Convert linked fragments to Markdown at ingestion and replace the selected draft range through the existing editor command.

* fix(app): keep pasted links undoable while drafting offline

Use the browser edit command for converted paste so selection replacement participates in Undo and normal input publication. Keep complete Markdown clipboard text when it already carries the link destinations, and limit connection gating to image uploads.

* fix(app): preserve copied Markdown with normalized links

Copy renders normalized URLs in HTML while retaining original Markdown in plain text. Compare parsed destinations using the same Markdown parser so pasting complete responses keeps tables and formatting intact.

* fix(app): retain external linked tables when pasting prompts

Recovering missing link destinations must retain table rows and columns. Use the existing table converter and keep cell delimiters and line breaks inside their cells.

* test(app): name rich clipboard paste arguments

* fix(app): preserve pasted links around rowless tables

The table converter requires a first row. Convert rowless table content separately so empty markup cannot abort recovery of surrounding destinations.

* test(app): wait for workspace restore before undo teardown

The directory appears before git finishes recreating the worktree. Wait for the host to publish its active workspace before cleanup removes the source repository.

---------

Co-authored-by: paseo-bot[bot] <266920839+paseo-bot[bot]@users.noreply.github.com>

packages/app/e2e/browser/composer-focus.spec.ts

@@ -1,5 +1,11 @@
 import { expect, test, type Page } from "../support/fixtures";
 import {
+  pasteRichTextIntoComposer,
+  fillComposerDraft,
+  copyLatestTurnIntoComposer,
+  selectComposerDraftRange,
+  undoComposerEdit,
+  redoComposerEdit,
   blurComposerInput,
   roundTripComposerTabBeforePaint,
   composerLocator,
@@ -28,6 +34,7 @@ import {
   openMobileAgentSidebarWithKeyboard,
   swipeOpenMobileExplorer,
 } from "../support/helpers/sidebar";
+import { installDaemonWebSocketGate } from "../support/helpers/daemon-websocket-gate";
 import { readScrollMetrics } from "../support/helpers/agent-bottom-anchor";
 import {
   expectTimelinePromptPositionPreserved,
@@ -55,7 +62,9 @@ test("clicking chat text or background focuses the feed for keyboard paging", as
     await expect
       .poll(async () => (await readScrollMetrics(page)).offsetY)
       .toBeLessThan(beforePaging.offsetY - beforePaging.viewportHeight / 2);
-    await page.screenshot({ path: testInfo.outputPath("chat-keyboard-paging.png") });
+    await page.screenshot({
+      path: testInfo.outputPath("chat-keyboard-paging.png"),
+    });
     await page.keyboard.press("PageDown");
     await expect
       .poll(async () => (await readScrollMetrics(page)).distanceFromBottom)
@@ -124,11 +133,15 @@ test("focusing the feed preserves assistant text selection and code copy control
 });
 
 test("submitting a message leaves the composer ready for the next message", async ({ page }) => {
+  const copiedTable =
+    "| Resource | Status |\n| --- | --- |\n| [Unicode](https://example.com/日本語) | ~~closed~~ |\n| [Space](<https://example.com/a b>) | **open** |\n| [ASCII](https://example.com/1) | closed |";
   const agent = await seedMockAgentWorkspace({
     repoPrefix: "composer-focus-",
     title: "Composer focus",
+    featureValues: { mockAssistantResponse: copiedTable },
   });
 
+  const connection = await installDaemonWebSocketGate(page);
   try {
     await openAgentRoute(page, agent);
     await expectComposerVisible(page);
@@ -136,8 +149,62 @@ test("submitting a message leaves the composer ready for the next message", asyn
     await submitMessage(page, "First message");
     await expectComposerFocused(page);
 
-    await typeIntoFocusedComposer(page, "Second message");
-    await expectComposerDraft(page, "Second message");
+    await typeIntoFocusedComposer(page, "Investigate: replace this. Thanks");
+    await selectComposerDraftRange(page, 13, 25);
+    await pasteRichTextIntoComposer({
+      page,
+      html: '<a href="https://example.com/issues/39150">this FR</a>',
+      text: "this FR",
+    });
+    await expectComposerDraft(
+      page,
+      "Investigate: [this FR](https://example.com/issues/39150). Thanks",
+    );
+    await undoComposerEdit(page);
+    await expectComposerDraft(page, "Investigate: replace this. Thanks");
+    await redoComposerEdit(page);
+    await expectComposerDraft(
+      page,
+      "Investigate: [this FR](https://example.com/issues/39150). Thanks",
+    );
+    await typeIntoFocusedComposer(page, " next");
+    await expectComposerDraft(
+      page,
+      "Investigate: [this FR](https://example.com/issues/39150) next. Thanks",
+    );
+    await agent.client.waitForFinish(agent.agentId, 15_000);
+    await expect(page.getByRole("button", { name: "Copy turn", exact: true })).toBeVisible();
+    await connection.drop();
+    await connection.waitForBlockedConnection();
+    await pasteRichTextIntoComposer({
+      page,
+      html: '<a href="https://example.com/offline">offline link</a>',
+      text: "offline link",
+    });
+    await expectComposerDraft(
+      page,
+      "Investigate: [this FR](https://example.com/issues/39150) next[offline link](https://example.com/offline). Thanks",
+    );
+    await fillComposerDraft(page, "");
+    await pasteRichTextIntoComposer({
+      page,
+      html: '<table><thead><tr><th>Resource</th><th>Status</th></tr></thead><tbody><tr><td><a href="https://example.com/issue">Issue</a></td><td>closed</td></tr></tbody></table>',
+      text: "Resource\tStatus\nIssue\tclosed",
+    });
+    await expectComposerDraft(
+      page,
+      "| Resource | Status |\n| --- | --- |\n| [Issue](https://example.com/issue) | closed |",
+    );
+    await fillComposerDraft(page, "");
+    await pasteRichTextIntoComposer({
+      page,
+      html: '<a href="https://example.com/">Issue</a><table></table>',
+      text: "Issue",
+    });
+    await expectComposerDraft(page, "[Issue](https://example.com/)");
+    await copyLatestTurnIntoComposer(page);
+    await expectComposerDraft(page, copiedTable);
+    await expectComposerFocused(page);
   } finally {
     await agent.cleanup();
   }
@@ -168,7 +235,11 @@ async function waitForAnimationFrames(page: Page, count: number): Promise<void>
 test.describe("touch screen wide enough for the desktop layout", () => {
   // A tablet or an unfolded foldable gets the desktop layout, but focusing the
   // composer there raises the on-screen keyboard over the conversation.
-  test.use({ viewport: { width: 1024, height: 768 }, isMobile: true, hasTouch: true });
+  test.use({
+    viewport: { width: 1024, height: 768 },
+    isMobile: true,
+    hasTouch: true,
+  });
 
   test("remounting an inline composer does not restore focus on touch", async ({ page }) => {
     const agent = await seedMockAgentWorkspace({
@@ -192,7 +263,9 @@ test.describe("touch screen wide enough for the desktop layout", () => {
   test("returning to an inactive inline composer does not restore focus on touch", async ({
     page,
   }) => {
-    const workspace = await seedWorkspace({ repoPrefix: "composer-touch-retained-" });
+    const workspace = await seedWorkspace({
+      repoPrefix: "composer-touch-retained-",
+    });
     try {
       const first = await createMockIdleAgent(workspace.client, {
         cwd: workspace.repoPath,

packages/app/e2e/browser/workspace-archive-undo.spec.ts

@@ -112,6 +112,7 @@ test.describe("Workspace archive undo", () => {
 
     await expect(workspaceRow(page, worktree.workspaceId)).toBeVisible({ timeout: 30_000 });
     await expectDirectoryPresence(worktree.workspaceDirectory, true);
+    await expectHostWorkspaceSettledActive(client, worktree.workspaceId);
   });
 
   test("hovering Undo keeps the toast open past its deadline, and its close ends the undo", async ({

packages/app/e2e/support/helpers/composer.ts

@@ -31,7 +31,9 @@ export async function expectComposerVisible(
   page: Page,
   options?: { timeout?: number },
 ): Promise<void> {
-  await expect(composerInput(page)).toBeVisible({ timeout: options?.timeout ?? 15_000 });
+  await expect(composerInput(page)).toBeVisible({
+    timeout: options?.timeout ?? 15_000,
+  });
 }
 
 export async function expectComposerDisabled(page: Page): Promise<void> {
@@ -156,7 +158,9 @@ export async function attachImageFromMenu(
 }
 
 export async function expectAttachmentPill(page: Page, testID: string): Promise<void> {
-  await expect(page.getByTestId(testID).first()).toBeVisible({ timeout: 10_000 });
+  await expect(page.getByTestId(testID).first()).toBeVisible({
+    timeout: 10_000,
+  });
 }
 
 export async function attachFileFromMenu(
@@ -218,18 +222,24 @@ export async function expectGithubAttachmentPill(
 
 export async function openImageLightbox(page: Page): Promise<void> {
   await page.getByRole("button", { name: "Open image attachment" }).first().click();
-  await expect(page.getByTestId("attachment-lightbox-close")).toBeVisible({ timeout: 5_000 });
+  await expect(page.getByTestId("attachment-lightbox-close")).toBeVisible({
+    timeout: 5_000,
+  });
 }
 
 export async function closeImageLightbox(page: Page): Promise<void> {
   await page.keyboard.press("Escape");
-  await expect(page.getByTestId("attachment-lightbox-close")).not.toBeVisible({ timeout: 5_000 });
+  await expect(page.getByTestId("attachment-lightbox-close")).not.toBeVisible({
+    timeout: 5_000,
+  });
 }
 
 export async function openGithubPickerFromMenu(page: Page): Promise<void> {
   await openAttachmentMenu(page);
   await page.getByTestId("message-input-attachment-menu-item-github").click();
-  await expect(page.getByTestId("combobox-desktop-container")).toBeVisible({ timeout: 5_000 });
+  await expect(page.getByTestId("combobox-desktop-container")).toBeVisible({
+    timeout: 5_000,
+  });
 }
 
 /** Open picker, type a query, wait for the matching option by id (e.g. "issue:3", "change_request:1"), and click it. */
@@ -283,7 +293,10 @@ export async function startRunningMockAgent(
     model: opts.model,
     featureValues: opts.featureValues,
   });
-  const agentUrl = `${buildHostWorkspaceRoute(serverId, workspace.id)}?open=${encodeURIComponent(`agent:${agent.id}`)}`;
+  const agentUrl = `${buildHostWorkspaceRoute(
+    serverId,
+    workspace.id,
+  )}?open=${encodeURIComponent(`agent:${agent.id}`)}`;
   await page.goto(agentUrl);
   await expectComposerVisible(page);
   await client.sendAgentMessage(agent.id, opts.prompt);
@@ -347,7 +360,11 @@ export async function pasteComposerTestImage(page: Page): Promise<boolean> {
     const bytes = Uint8Array.from(atob(base64), (character) => character.charCodeAt(0));
     const clipboardData = new DataTransfer();
     clipboardData.items.add(new File([bytes], "pasted.png", { type: "image/png" }));
-    const event = new ClipboardEvent("paste", { clipboardData, bubbles: true, cancelable: true });
+    const event = new ClipboardEvent("paste", {
+      clipboardData,
+      bubbles: true,
+      cancelable: true,
+    });
     input.dispatchEvent(event);
     return event.defaultPrevented;
   }, COMPOSER_TEST_IMAGE_BASE64);
@@ -505,7 +522,10 @@ export async function recordVisibleComposerGeometry(page: Page): Promise<void> {
 export async function expectNoCollapsedVisibleComposer(page: Page): Promise<void> {
   const frames = await page.evaluate(() => {
     Reflect.get(window, "__stopComposerGeometry")?.();
-    return Reflect.get(window, "__composerGeometryFrames") as { input: number; root: number }[];
+    return Reflect.get(window, "__composerGeometryFrames") as {
+      input: number;
+      root: number;
+    }[];
   });
   expect(frames.length).toBeGreaterThan(0);
   expect(frames.filter((frame) => frame.root < 42 || frame.input < 42)).toEqual([]);
@@ -516,7 +536,10 @@ export async function roundTripComposerTabBeforePaint(
   page: Page,
   activeChatTitle: string,
 ): Promise<void> {
-  const activeTab = page.getByRole("button", { name: activeChatTitle, exact: true });
+  const activeTab = page.getByRole("button", {
+    name: activeChatTitle,
+    exact: true,
+  });
   await expect(activeTab).toHaveAttribute("aria-selected", "true");
   const result = await activeTab.evaluate((tab) => {
     const editor = document.activeElement;
@@ -556,7 +579,10 @@ export async function roundTripComposerTabBeforePaint(
           });
         }
       });
-      observer.observe(tab, { attributes: true, attributeFilter: ["aria-selected"] });
+      observer.observe(tab, {
+        attributes: true,
+        attributeFilter: ["aria-selected"],
+      });
       shortcut("BracketLeft");
     });
   });
@@ -566,3 +592,44 @@ export async function roundTripComposerTabBeforePaint(
   ).toBe(true);
   expect(result.focused, "returning on touch must leave the composer unfocused").toBe(false);
 }
+
+/** Paste both clipboard representations through the browser's normal paste command. */
+export async function pasteRichTextIntoComposer({
+  page,
+  html,
+  text,
+}: {
+  page: Page;
+  html: string;
+  text: string;
+}): Promise<void> {
+  await page.context().grantPermissions(["clipboard-read", "clipboard-write"]);
+  await page.evaluate(
+    async ({ html: richHtml, text: plainText }) => {
+      await navigator.clipboard.write([
+        new ClipboardItem({
+          "text/html": new Blob([richHtml], { type: "text/html" }),
+          "text/plain": new Blob([plainText], { type: "text/plain" }),
+        }),
+      ]);
+    },
+    { html, text },
+  );
+  await composerInput(page).press("ControlOrMeta+v");
+}
+
+export async function undoComposerEdit(page: Page): Promise<void> {
+  await composerInput(page).press("ControlOrMeta+z");
+}
+export async function redoComposerEdit(page: Page): Promise<void> {
+  await composerInput(page).press("ControlOrMeta+Shift+z");
+}
+
+/** Reuse the actual response Copy action and the browser's native paste. */
+export async function copyLatestTurnIntoComposer(page: Page): Promise<void> {
+  await page.context().grantPermissions(["clipboard-read", "clipboard-write"]);
+  await page.getByRole("button", { name: "Copy turn", exact: true }).last().click();
+  await expect(page.getByRole("button", { name: "Copied", exact: true })).toBeVisible();
+  await composerInput(page).fill("");
+  await composerInput(page).press("ControlOrMeta+v");
+}

packages/app/src/composer/input/input.tsx

@@ -88,6 +88,7 @@ import { RenderProfile } from "@/utils/render-profiler";
 import { useComposerHeight } from "./height";
 import { ComposerInputPresentation } from "./presentation";
 import { resolveComposerInputMode, type ComposerInputMode } from "@/composer/input-mode";
+import { pasteLinkedClipboardText } from "@/composer/pasted-text";
 import type { NativePastedFile } from "@/composer/native-pasted-image";
 import {
   EditingTextInput,
@@ -513,7 +514,7 @@ function getTextInputNativeElement(current: ComposerTextInputHandle | null): HTM
   return native instanceof HTMLElement ? native : null;
 }
 
-interface PasteImagesEffectArgs {
+interface PasteEffectArgs {
   textarea: HTMLElement | null;
   isConnected: boolean;
   disabled: boolean;
@@ -522,7 +523,7 @@ interface PasteImagesEffectArgs {
   onAddImages: ((images: ImageAttachment[]) => void) | undefined;
 }
 
-function usePasteImagesEffect(args: PasteImagesEffectArgs): void {
+function usePasteEffect(args: PasteEffectArgs): void {
   const {
     textarea,
     isConnected,
@@ -533,16 +534,20 @@ function usePasteImagesEffect(args: PasteImagesEffectArgs): void {
   } = args;
 
   useEffect(() => {
-    if (!isWeb || !onAddImages) return;
+    if (!isWeb) return;
 
     if (!textarea) return;
 
     let disposed = false;
     const handlePaste = (event: ClipboardEvent) => {
-      if (!isConnected || disabled || isDictating || isRealtimeVoiceForCurrentAgent) return;
+      if (disabled || isDictating || isRealtimeVoiceForCurrentAgent) return;
 
       const imageFiles = collectImageFilesFromClipboardData(event.clipboardData);
-      if (imageFiles.length === 0) return;
+      if (imageFiles.length === 0) {
+        if (pasteLinkedClipboardText(textarea, event.clipboardData)) event.preventDefault();
+        return;
+      }
+      if (!isConnected || !onAddImages) return;
 
       event.preventDefault();
 
@@ -1811,7 +1816,7 @@ export const MessageInput = forwardRef<MessageInputRef, MessageInputProps>(
       handleAlternateSendAction();
     }, [alternateSendAction, handleAlternateSendAction]);
 
-    usePasteImagesEffect({
+    usePasteEffect({
       textarea: webTextArea,
       isConnected,
       disabled,

packages/app/src/composer/pasted-text.browser.test.ts

@@ -0,0 +1,144 @@
+import { afterEach, describe, expect, it } from "vitest";
+import { createMarkdownClipboardContent } from "@/utils/rich-clipboard";
+import { pasteLinkedClipboardText } from "./pasted-text.web";
+
+const inputs: HTMLTextAreaElement[] = [];
+function editor(): HTMLTextAreaElement {
+  const input = document.createElement("textarea");
+  document.body.append(input);
+  inputs.push(input);
+  return input;
+}
+afterEach(() => {
+  for (const input of inputs.splice(0)) input.remove();
+});
+
+function clipboard(html: string, text: string): DataTransfer {
+  const data = new DataTransfer();
+  data.setData("text/html", html);
+  data.setData("text/plain", text);
+  return data;
+}
+
+describe("pasted prompt links", () => {
+  it.each([
+    "https://example.com/1",
+    "https://example.com/日本語",
+    "<https://example.com/a b>",
+    "https://例え.テスト/issue",
+  ])("keeps complete Markdown from Copy with destination %s", (destination) => {
+    const source = `| Resource | Status |\n| --- | --- |\n| [issue](${destination}) | ~~closed~~ |`;
+    const content = createMarkdownClipboardContent(source);
+    const input = editor();
+    expect(pasteLinkedClipboardText(input, clipboard(content.html, content.plainText))).toBe(false);
+    expect(input.value).toBe("");
+  });
+  it("converts external links when plain text names the resource but omits a destination", () => {
+    const input = editor();
+    expect(
+      pasteLinkedClipboardText(
+        input,
+        clipboard(
+          '<a href="https://example.com/%E6%97%A5%E6%9C%AC%E8%AA%9E">日本語</a> and <a href="https://example.com/missing">another</a>',
+          "[日本語](https://example.com/日本語) and another",
+        ),
+      ),
+    ).toBe(true);
+    expect(input.value).toBe(
+      "[日本語](https://example.com/%E6%97%A5%E6%9C%AC%E8%AA%9E) and [another](https://example.com/missing)",
+    );
+  });
+  it("preserves a labeled resource URL as Markdown", () => {
+    const data = clipboard(
+      'Hey can you take a look at <a href="https://example.com/issues/39150">this FR</a> and...',
+      "Hey can you take a look at this FR and...",
+    );
+    const input = editor();
+    expect(pasteLinkedClipboardText(input, data)).toBe(true);
+    expect(input.value).toBe(
+      "Hey can you take a look at [this FR](https://example.com/issues/39150) and...",
+    );
+  });
+
+  it("preserves external linked table rows and columns", () => {
+    const input = editor();
+    expect(
+      pasteLinkedClipboardText(
+        input,
+        clipboard(
+          '<table><thead><tr><th>Resource</th><th>Status</th></tr></thead><tbody><tr><td><a href="https://example.com/issue">Issue</a></td><td>closed</td></tr></tbody></table>',
+          "Resource\tStatus\nIssue\tclosed",
+        ),
+      ),
+    ).toBe(true);
+    expect(input.value).toBe(
+      "| Resource | Status |\n| --- | --- |\n| [Issue](https://example.com/issue) | closed |",
+    );
+  });
+
+  it("keeps table cell separators and line breaks inside their cells", () => {
+    const input = editor();
+    expect(
+      pasteLinkedClipboardText(
+        input,
+        clipboard(
+          '<table><tr><th>Resource</th><th>Status</th></tr><tr><td><a href="https://example.com/issue">Issue | tracker</a></td><td>closed<br>today</td></tr></table>',
+          "Resource\tStatus\nIssue | tracker\tclosed today",
+        ),
+      ),
+    ).toBe(true);
+    expect(input.value).toBe(
+      "| Resource | Status |\n| --- | --- |\n| [Issue \\| tracker](https://example.com/issue) | closed<br>today |",
+    );
+  });
+
+  it("retains headerless tables as HTML without inventing a heading", () => {
+    const html =
+      '<table><tbody><tr><td><a href="https://example.com/issue">Issue</a></td><td>closed</td></tr><tr><td>Other</td><td>open</td></tr></tbody></table>';
+    const input = editor();
+    expect(pasteLinkedClipboardText(input, clipboard(html, "Issue\tclosed\nOther\topen"))).toBe(
+      true,
+    );
+    expect(input.value).toBe(html);
+  });
+
+  it.each([
+    ["<table></table>", ""],
+    ["<table><caption>Context</caption></table>", "\n\nContext"],
+  ])("keeps surrounding links when a table has no rows: %s", (table, caption) => {
+    const input = editor();
+    expect(
+      pasteLinkedClipboardText(
+        input,
+        clipboard(`<a href="https://example.com/">Issue</a>${table}`, "Issue"),
+      ),
+    ).toBe(true);
+    expect(input.value).toBe(`[Issue](https://example.com/)${caption}`);
+  });
+
+  it("leaves plain text and rich text without links to native paste", () => {
+    const input = editor();
+    expect(pasteLinkedClipboardText(input, clipboard("", "[link](https://example.com)"))).toBe(
+      false,
+    );
+    expect(pasteLinkedClipboardText(input, clipboard("<b>hello</b>", "hello"))).toBe(false);
+    expect(pasteLinkedClipboardText(input, null)).toBe(false);
+    expect(input.value).toBe("");
+  });
+
+  it("keeps paragraphs and multiple links", () => {
+    const input = editor();
+    expect(
+      pasteLinkedClipboardText(
+        input,
+        clipboard(
+          '<p>See <a href="https://example.com/a">one</a></p><p>and <a href="https://example.com/b">two</a></p>',
+          "See one\n\nand two",
+        ),
+      ),
+    ).toBe(true);
+    expect(input.value).toBe(
+      "See [one](https://example.com/a)\n\nand [two](https://example.com/b)",
+    );
+  });
+});

packages/app/src/composer/pasted-text.ts

@@ -0,0 +1,7 @@
+/** Native inputs retain their platform clipboard handling. */
+export function pasteLinkedClipboardText(
+  _input: HTMLElement,
+  _clipboard: Pick<DataTransfer, "getData"> | null,
+): boolean {
+  return false;
+}

packages/app/src/composer/pasted-text.web.ts

@@ -0,0 +1,59 @@
+import TurndownService from "turndown";
+import { tables } from "turndown-plugin-gfm";
+import { createAssistantMarkdownParser } from "@/utils/assistant-markdown-parser";
+
+const markdown = new TurndownService({
+  codeBlockStyle: "fenced",
+  bulletListMarker: "-",
+});
+// Heading tables become Markdown; headerless tables retain their HTML structure.
+markdown.use(tables);
+markdown.addRule("rowlessTable", {
+  filter: (node) => node.nodeName === "TABLE" && (node as HTMLTableElement).rows.length === 0,
+  replacement: (content) => (content ? `\n\n${content}\n\n` : ""),
+});
+markdown.addRule("tableCell", {
+  filter: ["th", "td"],
+  replacement: (content, node) => {
+    const prefix = node.previousElementSibling ? " " : "| ";
+    const cell = content.trim().replace(/\|/g, "\\|").replace(/ *\n/g, "<br>");
+    return `${prefix}${cell} |`;
+  },
+});
+const copiedMarkdown = createAssistantMarkdownParser();
+
+function linkDestinations(fragment: Document): string[] {
+  return Array.from(fragment.querySelectorAll("a[href]"), (link) => link.getAttribute("href")!);
+}
+
+function containsDestinations(plainText: string, destinations: string[]): boolean {
+  if (destinations.every((url) => plainText.includes(url))) return true;
+
+  // Copy normalizes Markdown URLs in HTML (percent encoding, internationalized
+  // domains). Compare parsed destinations using that same parser, not URL spelling.
+  const rendered = new DOMParser().parseFromString(copiedMarkdown.render(plainText), "text/html");
+  const links = new Set(linkDestinations(rendered));
+  return destinations.every((url) => plainText.includes(url) || links.has(url));
+}
+
+/** Paste linked HTML as Markdown through the browser's undoable editing command. */
+export function pasteLinkedClipboardText(
+  input: HTMLElement,
+  clipboard: Pick<DataTransfer, "getData"> | null,
+): boolean {
+  const html = clipboard?.getData("text/html");
+  if (!html) return false;
+
+  // Parse in a detached document. Clipboard markup is never mounted in the app.
+  const fragment = new DOMParser().parseFromString(html, "text/html");
+  const destinations = linkDestinations(fragment);
+  const plainText = clipboard!.getData("text/plain");
+  // Copy actions already put complete Markdown on the clipboard. Keep that
+  // representation, including tables and formatting, whenever it carries the URLs.
+  if (containsDestinations(plainText, destinations)) return false;
+  const text = markdown.turndown(fragment.body);
+  input.focus();
+  // Direct value assignment drops the textarea's undo history. This also emits
+  // the normal input event so the editor publishes its new draft as for typing.
+  return input.ownerDocument.execCommand("insertText", false, text);
+}

packages/app/src/types/turndown-plugin-gfm.d.ts

@@ -1,5 +1,6 @@
 declare module "turndown-plugin-gfm" {
   import type TurndownService from "turndown";
 
+  export const tables: TurndownService.Plugin;
   export const gfm: TurndownService.Plugin;
 }