// Please enter a detailed description of the issue
// Description of the issue:

When inserting a TOC in MultiMarkdown Composer, links which have international characters (in my case: ä / ö / ü / ß) don't work. When clicking on the produced links, nothing happens

// Please enter a list of steps required to reproduce the issue
// Steps to reproduce:

1. Create a document with headings with umlauts in MultiMarkdown Composer
2. Insert a Table of contents somewhere with {{TOC}} in the document
3. Preview with Marked 2
4. Click on one of the links with umlauts

The links will work in the MultiMarkdown Composer preview, but not in Marked 2

// If applicable please attach a sample document that causes the issue for you.

{{TOC}}

# Heading 1

Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1 Text 1

## Heading 2 with ä

Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2 Text 2

## Heading 3

Text 3

// Configuration (do not edit)
Marked 2 985 (Direct)
macOS Version: 10.15.4
---
additionalMathJaxConfig:
allowPageBreakInCode: YES
bookTxtIsLeanpub: NO
summaryMdIsGitBook: NO
codeIsPoetry: NO
codeCanWrap: YES
collapsibleHeadlines: NO
convertGithubCheckboxes: YES
convertYAMLToMMD: NO
defaultMathJaxConfig: TeX-AMS-MML_HTMLorMML
defaultPreviewStyle: 103
defaultProcessor: MultiMarkdown
enableMiniMap: NO
excludeBlockQuotesFromCounts: NO
excludeFootnotesFromCounts: NO
excludeVerbatimFromCounts: NO
excludeCaptionsFromCounts: NO
folderPreviewExtensionsArray: md, markdown, txt, mdown, html, opml
githubNewlines: YES
h1IsPageBreak: NO
h2IsPageBreak: NO
hrIsPageBreak: NO
includeMathJax: NO
includeKatex: NO
limitTextWidth: NO
minimalJavaScript: NO
outlineModeExtensions:
permissionGranted: NO
printHeaderBottomLeft:
printHeaderBottomRight:
printHeaderFirstPage: NO
printFooterFirstPage: NO
printHeaderTopLeft:
printHeaderTopRight:
processHTMLFiles: YES
removeMetadataForPreview: NO
removeYAMLHeaders: NO
scrollToEdit: YES
shouldDetectCritic: YES
shouldHighlightMarkupErrors: YES
shouldLoadCritic: NO
syntaxHighlight: NO
syntaxHighlightOnlyLang: NO
useCustomMarkdownProcessor: NO
customMarkdownProcessor:
useCustomPreprocessor: NO
customPreprocessor:
useFirstH1AsPrintTitle: YES