@Phosphenes @noplasticshower @futurebird @aeveltstra There are some reasons to be a tiny bit skeptical about this demo.
Plummer omits printing as a feature, which smells like he's tried this before, and found that printing was a stumbling block.
A Windows Notepad-alike is such a simple application that it was used as a teaching example pretty frequently. An LLM that's been trained on textbooks and sample code is going to be much more familiar with Notepad than it will be with whatever random thing you're seriously trying to build now.
Notepad is simple partly because it doesn't even have any of the really important, difficult code -- the text editor itself -- in it. That editor component is built in to Windows. Text editing is complicated enough that most little Notepad replacements are built on top of someone else's text editor library (Notepad++ and Geany both use Scintilla, for example).