I went the same path of writing a text editor from scratch. There are a lot of moving parts, so I tried to outsource as much features as possible - LSP for intellisense, tree-sitter for highlighting and syntax-aware features, fzf for search and file handling, etc. I also tried to design it so that it can be tweaked to one's needs with simple code changes, suckless-style.
It was indeed a pain using it for the first few weeks, where every 5 minutes I found some bug and had to go back and fix it, instead of steadily working on some other project. Good news is more bugs you fix, less bugs is left.
Nice work! And yes, that gradual acceleration of productivity where your fixes and tweaks from the past compound on your ability to get things done in the future is a great feeling.