UTF-8 characters like EN DASH (–) and EM DASH (—) are displayed as squares in Preview Pane

[DKWien]

When using MarkdownShellExtensions on Windows Explorer, certain UTF-8 characters such as EN DASH (–, U+2013) and EM DASH (—, U+2014) are not rendered correctly in the preview pane. Instead, they appear as small squares ▢.

Details:

• The .md file is saved as UTF-8 without BOM (verified in Notepad++)
• Fonts tested: Segoe UI, JetBrains Mono, Consolas → same problem
• Normal hyphen-minus - displays fine, but – and — are not recognized
• The issue seems related to UTF-8 parsing or codepage fallback in the rendering component

Steps to Reproduce:

1. Create a test.md file with the following content:

   - normal hyphen
   – en dash
   — em dash
   

2. Open the file in Windows Explorer with MarkdownShellExtensions preview enabled

3. Observe: only the first line renders correctly, others show ▢

Expected Behavior:
All characters should render properly as long as the selected font supports them (e.g. JetBrains Mono does).

Environment:

• Windows 11 x64
• MarkdownShellExtensions (latest release, [insert version])
• Preview Pane enabled in Explorer

Possible Cause:

• Text not being parsed as UTF-8, fallback to Windows-1252
• Missing explicit UTF-8 decoding in the Delphi rendering code