fix: avoid linkifying custom URI Windows paths

Author: Dimillian

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

@@ -448,6 +448,18 @@ describe("Markdown file-like href behavior", () => {
     expect(container.textContent).toContain("/workspace/settings#L12");
   });
 
+  it("does not linkify Windows file paths embedded in custom URIs", () => {
+    const { container } = render(
+      <Markdown
+        value="Open vscode://file/C:/repo/src/App.tsx:12 in VS Code."
+        className="markdown"
+      />,
+    );
+
+    expect(container.querySelector(".message-file-link")).toBeNull();
+    expect(container.textContent).toContain("vscode://file/C:/repo/src/App.tsx:12");
+  });
+
   it("does not turn workspace review #L anchors in inline code into file links", () => {
     const { container } = render(
       <Markdown

src/features/messages/utils/messageFileLinks.ts

@@ -45,6 +45,7 @@ const FILE_PATH_MATCH = new RegExp(`^${FILE_PATH_PATTERN.source}$`);
 const TRAILING_PUNCTUATION = new Set([".", ",", ";", ":", "!", "?", ")", "]", "}"]);
 const LETTER_OR_NUMBER_PATTERN = /[\p{L}\p{N}.]/u;
 const URL_SCHEME_PREFIX_PATTERN = /[a-zA-Z][a-zA-Z0-9+.-]*:\/\/\/?$/;
+const EMBEDDED_URL_SCHEME_PATTERN = /[a-zA-Z][a-zA-Z0-9+.-]*:\/\/\S*$/;
 const PATH_CANDIDATE_PREFIX_BOUNDARY_PATTERN = /[\s<>"'()`[\]{}]/u;
 const LIKELY_LOCAL_ABSOLUTE_PATH_PREFIXES = [
   "/Users/",
@@ -198,7 +199,10 @@ function isPathCandidate(
   leadingText: string,
   previousChar: string,
 ) {
-  if (URL_SCHEME_PREFIX_PATTERN.test(leadingText)) {
+  if (
+    URL_SCHEME_PREFIX_PATTERN.test(leadingText) ||
+    EMBEDDED_URL_SCHEME_PATTERN.test(leadingText)
+  ) {
     return false;
   }
   if (/^[A-Za-z]:[\\/]/.test(value) || value.startsWith("\\\\")) {

src/features/messages/utils/remarkFileLinks.test.ts

@@ -66,4 +66,11 @@ describe("remarkFileLinks", () => {
     );
     expect(tree.children?.[0]?.children?.map((child) => child.type)).toEqual(["text"]);
   });
+
+  it("does not split custom URIs that embed Windows file paths", () => {
+    const tree = runRemarkFileLinks(
+      textParagraph("Open vscode://file/C:/repo/src/App.tsx:12 in VS Code."),
+    );
+    expect(tree.children?.[0]?.children?.map((child) => child.type)).toEqual(["text"]);
+  });
 });