I assume parent means that the compiled flutter app uses GTK3 as the shell for spawning windows and initializing the Skia context to which the app can render.

I assume parent means that the compiled flutter app uses GTK3 as the shell for spawning windows and initializing the Skia context to which the app can render. This is also how Druid the Rust GUI framework works on Linux. Use GTK to start the window and the paint surface (Cairo).