Several years ago Apple curtailed the ability to select text in Quick Look previews, much to my dismay. A new extension for macOS brings text selection back, at least to source code and Markdown previews. It also renders Markdown and does source code highlighting (with line numbers). But the big deal for me is the text selection. Latest version also works well with HoudahSpot, Forklift, and Path Finder's Quick Look previews.
