Gtk+Adwaita Markdown Editor in ~600 lines
Summary
This GitHub Gist documents a GTK4 Libadwaita based Markdown editor prototype (~600 lines) with a live preview powered by a WebView using Marked.js and KaTeX. It includes a monospace editor, centered tabs for Source and Rendered views, and file I/O support, designed as a portable self-contained component for GTK apps.