Originally reported by @greazer

1. Open a Python file with a #%% cell in it
2. Shift+Enter to execute
3. Run code from the interactive window input box <-- this seems to be messing with sourcemaps or similar
4. Debug cell
5. 🐛 temp file containing our injected source code appears

This is likely the execution count getting messed up because we're not accounting for the cell submitted from the interactive window input box