fix(markdown): preserve escaped delimiters in code contexts

Author: mhulden

src/features/messages/components/Markdown.test.tsx

@@ -639,6 +639,38 @@ describe("Markdown file-like href behavior", () => {
     expect(container.textContent).toContain("\\]");
   });
 
+  it("does not rewrite escaped \\(inline\\) delimiters", () => {
+    const { container } = render(
+      <Markdown
+        value={["Literal: \\\\(x\\\\)", "Outside: \\(z^2\\)"].join("\n")}
+        className="markdown"
+        enableMathRendering
+      />,
+    );
+
+    expect(container.querySelectorAll(".katex").length).toBe(1);
+    expect(container.textContent).toContain("\\(x\\)");
+  });
+
+  it("does not render math inside blockquote-indented code blocks", () => {
+    const { container } = render(
+      <Markdown
+        value={[
+          ">     \\(x^2\\)",
+          ">     \\[x+y\\]",
+          "",
+          "Outside: \\(z^2\\)",
+        ].join("\n")}
+        className="markdown"
+        enableMathRendering
+      />,
+    );
+
+    expect(container.querySelectorAll(".katex").length).toBe(1);
+    expect(container.textContent).toContain("\\(x^2\\)");
+    expect(container.textContent).toContain("\\[x+y\\]");
+  });
+
   it("keeps math-like delimiters literal inside long fences with nested shorter fences", () => {
     const { container } = render(
       <Markdown

src/features/messages/components/Markdown.tsx

@@ -455,6 +455,16 @@ function replaceInlineLatexMathDelimiters(value: string) {
       if (!trimmed) {
         return match;
       }
+      let precedingBackslashes = 0;
+      for (let index = offset - 1; index >= 0; index -= 1) {
+        if (source[index] !== "\\") {
+          break;
+        }
+        precedingBackslashes += 1;
+      }
+      if (precedingBackslashes % 2 === 1) {
+        return match;
+      }
       const before = offset > 0 ? source[offset - 1] : "";
       const afterIndex = offset + match.length;
       const after = afterIndex < source.length ? source[afterIndex] : "";
@@ -527,7 +537,15 @@ function replaceBlockLatexMathDelimiters(value: string) {
 }
 
 function isIndentedCodeLine(line: string) {
-  return /^(?: {4}|\t)/.test(line);
+  let remaining = line;
+  while (true) {
+    const quotePrefixMatch = remaining.match(/^[ \t]{0,3}>[ \t]?/);
+    if (!quotePrefixMatch) {
+      break;
+    }
+    remaining = remaining.slice(quotePrefixMatch[0].length);
+  }
+  return /^(?: {4}|\t)/.test(remaining);
 }
 
 function normalizeLatexMathDelimitersInChunk(value: string) {