Advice for choosing a text editor:

• Avoid Electron.

• Avoid custom-looking GUI toolkits.

• Avoid IDEs, unless they're highly-modular with a rock-solid, simple base.

• Avoid complicated build toolchains.

I'm using Geany at the moment, which… almost meets the third criterion, and does meet the fourth. If Geany support stops, I'd vaguely be able to make changes to it; the code's written in C, licensed GPLv2+, and it's well-documented. (If GTK2+ or Scintilla support stop, of course, no dice; I don't understand any of that area of my software stack well enough.)

Of course, there are things I want it to do that it doesn't; Geany isn't perfect for my workflow. Better than trying to write my own, though!