Small bug report: 1) Clear the site data so you don't have a saved playground preloaded. 2) Focus the Javascript text area and type a singular "f", nothing more

Small bug report: 1) Clear the site data so you don't have a saved playground preloaded. 2) Focus the Javascript text area and type a singular "f", nothing more, nothing less, no other interactions. 3) The playground compiles, the cursor position in the Javascript text area is reset incorrectly.