From 61f668f3940ac588beaa5491bf105acda557add8 Mon Sep 17 00:00:00 2001
From: Okan YILDIRIM <63511519+ragokan@users.noreply.github.com>
Date: Fri, 23 Oct 2026 11:37:55 +0000
Subject: [PATCH] fix(app): preserve table headers during source adaptation

Replace the preceding line ending when inserting a table separator.
This keeps the separator before the header's source range, so entity
and local image edits cannot consume the paragraph break.
---
 .../src/components/markdown/renderer.test.ts  | 48 +++++++++++++++++++
 .../app/src/components/markdown/source.ts     |  3 +-
 2 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/packages/app/src/components/markdown/renderer.test.ts b/packages/app/src/components/markdown/renderer.test.ts
index 85b31eed46..c1c19f627d 100644
--- a/packages/app/src/components/markdown/renderer.test.ts
+++ b/packages/app/src/components/markdown/renderer.test.ts
@@ -146,6 +146,18 @@ it.each([
     "Notes\n\nItem | Detail\n:--- | ---:\nA | one",
     ["Document", "Paragraph", "Table"],
   ],
+  [
+    "an entity at the start of a header without outer pipes",
+    "Notes\nAT&amp;T | Detail\n--- | ---\nA | one",
+    "Notes\n\nAT\\&T | Detail\n--- | ---\nA | one",
+    ["Document", "Paragraph", "Table"],
+  ],
+  [
+    "a local image at the start of a header without outer pipes",
+    "Notes\n![Local](assets/a.png) | Detail\n--- | ---\nA | one",
+    "Notes\n\nLocal | Detail\n--- | ---\nA | one",
+    ["Document", "Paragraph", "Table"],
+  ],
   [
     "CRLF lines",
     "Notes\r\n| Item |\r\n| --- |\r\n| A |",
@@ -205,6 +217,42 @@ it.each([
   expect(blocks(await parseMarkdown(rendered, flags))).toEqual(expected);
 });
 
+it.each([
+  [
+    "a literal backslash",
+    "Notes\\\n| Item |\n| --- |\n| A |",
+    "Notes\\\n\n| Item |\n| --- |\n| A |",
+    "Notes\\",
+  ],
+  [
+    "an entity and literal backslash with LF lines",
+    "AT&amp;T\\\n| Item |\n| --- |\n| A |",
+    "AT\\&T\\\n\n| Item |\n| --- |\n| A |",
+    "AT&T\\",
+  ],
+  [
+    "an entity and literal backslash with CRLF lines",
+    "AT&amp;T\\\r\n| Item |\r\n| --- |\r\n| A |",
+    "AT\\&T\\\r\n\r\n| Item |\r\n| --- |\r\n| A |",
+    "AT&T\\",
+  ],
+  [
+    "an entity and literal backslash with CR lines",
+    "AT&amp;T\\\r| Item |\r| --- |\r| A |",
+    "AT\\&T\\\r\r| Item |\r| --- |\r| A |",
+    "AT&T\\",
+  ],
+])(
+  "preserves paragraph text before an interrupting table in %s",
+  async (_name, source, separated, text) => {
+    const rendered = prepareMarkdownSource(source).render();
+    expect(rendered).toEqual(separated);
+    const tree = await parseMarkdown(rendered, { hardSoftBreaks: true, latexMath: false });
+    expect(tree.children?.map((node) => node.type)).toEqual(["Paragraph", "Table"]);
+    expect(tree.children?.[0]?.children?.map((node) => node.content).join("")).toEqual(text);
+  },
+);
+
 it.each([
   "```yaml\n---\nkey: value\n---\n```\n",
   "~~~md\n| Item |\n| --- |\n| A |\n~~~\n",
diff --git a/packages/app/src/components/markdown/source.ts b/packages/app/src/components/markdown/source.ts
index 177d571000..c1b13633c6 100644
--- a/packages/app/src/components/markdown/source.ts
+++ b/packages/app/src/components/markdown/source.ts
@@ -216,7 +216,8 @@ export function prepareMarkdownSource(
           Math.max(source.lastIndexOf("\n", start - 1), source.lastIndexOf("\r", start - 1)) + 1;
         const newline = source.slice(lineStart - 2, lineStart).replace(/[^\r\n]/g, "");
         const blank = source.slice(lineStart, start).replace(/[^>]/g, " ").trimEnd();
-        edits.push({ start: lineStart, end: lineStart, text: `${blank}${newline}` });
+        const boundary = lineStart - newline.length;
+        edits.push({ start: boundary, end: lineStart, text: `${newline}${blank}${newline}` });
       }
       if (node.type === "link") {
         const title = workspaceHoverTitle(node, source.slice(start, end), workspaceRoot);