code blocks dont show tabs

[Clinkr1000]

Issue description

for some reason the viewer isn't displaying horizontal tab characters like it should. i tried everything from using fonts like unifont to using literal <pre> tags. it works fine in the exported html file, but the viewer refuses to cooperate.

Markdown to reproduce

<pre style="tab-size: 4 !important; white-space: pre !important">
class Room extends Object {
    constructor(){
        super();
    }
}
</pre>

Screenshot

If available

Environment

• Notepad++ X.Y.Z (x86/x64)
• MarkdownViewer++ X.Y.Z
• Windows 7/8/10 (x86/x64)