Guard markdown preview anchor decoding

src/renderer/src/components/editor/MarkdownPreview.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, it } from 'vitest'
 import type { Worktree } from '../../../../shared/types'
 import {
+  decodeMarkdownPreviewAnchor,
   deriveMarkdownPreviewSourceRoot,
   findMarkdownPreviewOpenedEditFileId,
   findMarkdownPreviewSourceOpenFile,
@@ -31,6 +32,10 @@ function makeWorktree(id: string, path: string): Worktree {
 }
 
 describe('MarkdownPreview source link routing', () => {
+  it('falls back to the raw anchor when percent-decoding fails', () => {
+    expect(decodeMarkdownPreviewAnchor('%E0%A4%A')).toBe('%E0%A4%A')
+  })
+
   it('keeps the explicit source worktree when it exists', () => {
     const source = makeWorktree('wt-source', '/repo')
     const nested = makeWorktree('wt-nested', '/repo/packages/app')

src/renderer/src/components/editor/MarkdownPreview.tsx

@@ -315,6 +315,14 @@ function parseLineTarget(hash: string): { line: number; column?: number } | null
   return { line: Number(match[1]), column: match[2] ? Number(match[2]) : undefined }
 }
 
+export function decodeMarkdownPreviewAnchor(rawAnchor: string): string {
+  try {
+    return decodeURIComponent(rawAnchor)
+  } catch {
+    return rawAnchor
+  }
+}
+
 function normalizeMarkdownPreviewAbsolutePath(absolutePath: string): string {
   return absolutePath.replaceAll('\\', '/')
 }
@@ -684,7 +692,7 @@ export default function MarkdownPreview({
       return false
     }
 
-    const decodedAnchor = decodeURIComponent(rawAnchor)
+    const decodedAnchor = decodeMarkdownPreviewAnchor(rawAnchor)
     let target: HTMLElement | null = null
     for (const candidate of body.querySelectorAll<HTMLElement>('[id]')) {
       if (candidate.id === decodedAnchor) {