[GREENFOOT-797] Stop control panel buttons getting focus
In the standalone export, the buttons can get focus and this causes issues with keypresses (e.g. space triggers the button, so you cannot listen for space bar in a running scenario). The IDE version avoids this by focusing the world on run, but it is still a bit odd because the buttons cannot get focus again. We agreed in the meeting that the simplest fix was just to prevent the buttons (or speed slider) ever getting focus.
- Issue type: Bug
- Priority: Medium
- Fix versions: 3.5.1