fix: stop dropped files from inserting their path into the message body

components/email/__tests__/rich-text-editor-drop.test.tsx

@@ -0,0 +1,75 @@
+import { act, render, waitFor } from '@testing-library/react';
+import { describe, expect, it, vi } from 'vitest';
+import React from 'react';
+import type { Editor } from '@tiptap/core';
+
+import { RichTextEditor } from '../rich-text-editor';
+
+/** A drop from the desktop: the file plus its path as text, as Firefox sends it. */
+function fileDrop(file: File) {
+  const text = `file:///C:/Users/me/Downloads/${file.name}`;
+  const event = new Event('drop', { bubbles: true, cancelable: true }) as DragEvent;
+  Object.defineProperty(event, 'dataTransfer', {
+    value: {
+      files: [file],
+      types: ['Files', 'text/uri-list', 'text/plain'],
+      getData: (type: string) => (type === 'text/plain' || type === 'text/uri-list' ? text : ''),
+    },
+  });
+  return event;
+}
+
+async function setup(onImageUpload?: (file: File) => Promise<{ src: string } | null>) {
+  let editor: Editor | null = null;
+  const onDrop = vi.fn();
+  render(
+    <div onDrop={onDrop}>
+      <RichTextEditor
+        content="<p>Hello</p>"
+        onChange={() => {}}
+        onImageUpload={onImageUpload}
+        onEditorReady={(ed) => { editor = ed as unknown as Editor; }}
+      />
+    </div>
+  );
+  await waitFor(() => expect(editor).not.toBeNull());
+  const ed = editor as unknown as Editor;
+  // jsdom has no layout to resolve the drop point from.
+  ed.view.posAtCoords = () => ({ pos: 1, inside: -1 });
+  return { editor: ed, onDrop };
+}
+
+describe('RichTextEditor file drop', () => {
+  it('does not insert the path of a dropped file, and leaves the file to the composer', async () => {
+    const { editor, onDrop } = await setup(async () => ({ src: 'blob:x' }));
+    const event = fileDrop(new File(['%PDF'], 'report.pdf', { type: 'application/pdf' }));
+
+    act(() => { editor.view.dom.dispatchEvent(event); });
+
+    expect(editor.getText()).toBe('Hello');
+    expect(event.defaultPrevented).toBe(true);
+    expect(onDrop).toHaveBeenCalledTimes(1);
+  });
+
+  it('does not insert the path when there is no inline image upload', async () => {
+    const { editor, onDrop } = await setup();
+    const event = fileDrop(new File(['png'], 'photo.png', { type: 'image/png' }));
+
+    act(() => { editor.view.dom.dispatchEvent(event); });
+
+    expect(editor.getText()).toBe('Hello');
+    expect(onDrop).toHaveBeenCalledTimes(1);
+  });
+
+  it('still inlines a dropped image instead of attaching it', async () => {
+    const upload = vi.fn(async () => ({ src: 'blob:x' }));
+    const { editor, onDrop } = await setup(upload);
+    const file = new File(['png'], 'photo.png', { type: 'image/png' });
+
+    act(() => { editor.view.dom.dispatchEvent(fileDrop(file)); });
+
+    expect(upload).toHaveBeenCalledWith(file);
+    expect(editor.getText()).toBe('Hello');
+    expect(onDrop).not.toHaveBeenCalled();
+  });
+});

components/email/rich-text-editor.tsx

@@ -293,12 +293,15 @@ export function RichTextEditor({
         class: "tiptap min-h-[100px] px-4 py-3 text-sm text-foreground",
       },
       handleDrop: (view, event) => {
+        if (!event.dataTransfer?.files?.length) return false;
         const upload = onImageUploadRef.current;
-        if (!upload || !event.dataTransfer?.files?.length) return false;
-        const imageFiles = Array.from(event.dataTransfer.files).filter(f =>
-          f.type.startsWith("image/")
-        );
-        if (imageFiles.length === 0) return false;
+        const imageFiles = upload
+          ? Array.from(event.dataTransfer.files).filter(f => f.type.startsWith("image/"))
+          : [];
+        // A file dragged from the desktop also carries its path as text
+        // (file:///...), which ProseMirror would insert. Claim the drop but
+        // let it bubble so the composer attaches the file.
+        if (!upload || imageFiles.length === 0) return true;
         event.preventDefault();
         event.stopPropagation();
         for (const file of imageFiles) {