@@ -244,6 +244,11 @@ describe("media tables", () => {
       "<table>\n  <tr>\n    <th>\n      Before\n    </th>\n  </tr>\n  <tr><td>",
       "</td></tr>\n</table>",
     ],
+    [
+      "a cell indented by a space and a tab",
+      "<table>\n<tr><td>\n \tBefore\n</td><td>",
+      "</td></tr>\n</table>",
+    ],
   ])("splits a media table with %s line by line, as before", (_name, open, close) => {
     const body = `${open}\n\n${video}\n\n${close}`;
     expect(splitPullRequestBody(body)).toEqual([
 
@@ -34,7 +34,8 @@ const FENCE_PATTERN = /^\s{0,3}((?:`{3,})|(?:~{3,}))(.*)\r?$/u;
  */
 const VIDEO_TAG_MAX_LINES = 8;
 
-const INDENTED_CODE_PATTERN = /^(?: {4}|\t)/u;
+// A tab after up to three spaces still reaches the fourth column.
+const INDENTED_CODE_PATTERN = /^(?: {4}| {0,3}\t)/u;
 const BARE_URL_PATTERN = /^<?(https?:\/\/\S+?)>?$/u;
 const IMAGE_EXTENSION_PATTERN = /\.(?:png|jpe?g|gif|webp|avif|heic|heif|svg)(?:$|[?#])/iu;
 const MARKDOWN_LINK_PATTERN = /^\[[^\]]*\]\((https?:\/\/[^\s)]+)\)$/u;