(Copied from original User Voice forum)
"Unless I highlight code in the lower half of the Script Editor, it gets flushed away when I execute it.
As I develop a script it's common to execute the script several times to review modifications, but having to highlight everything just to prevent it from flushing is a pain.
Highlighting some parts of the script is a great way to achieve "selective" execution, so don't change this.
But if nothing is highlighted, execute everything and leave the code where it is."