“The leak was a single missing arena cleanup in a code path that ran on every keystroke.”
A great walk-through of how someone with twenty years of systems experience tracks down a memory leak in a real terminal emulator. The bug is small. The investigation is the point. Profilers, heap snapshots, careful reasoning about ownership. None of it is glamorous and all of it is the work that the AI tools do not yet do. Read it as a tutorial in how the actual job is performed.