The IDE should wait for you to release the F5 key before starting the program.

[mkilgore]

Fairly simple, currently if you hold down the F5 key the IDE will start spamming out copies of your program, which is pretty bad. Additionally, since programs can finish so quickly now you can end up still holding down the F5 key while the program runs, which the program will then receive as a keydown event.

Waiting for the user to release the F5 key ensures the program only gets run once, and also that they aren't holding the F5 key when it starts.