Selection boxes for new scratches & compiler settings often behave as if nothing as selected

[ethteck]

You have to toggle the selection in order for it to take effect.

To quote @Cuyler36, "You have to swap presets to get the flags to apply [for new scratches]."

I've also noticed that some options which should have a "none" or empty choice don't. So the first choice is visually selected, but the options text area isn't populated with it. If the user accidentally goes and messes with this option, there's no way to "clear" out the option without manually modifying the text area.

[ethteck]

I think all selection boxes for optional things should have a "Select an option" (or some other placeholder string) option that does nothing, so it's clear when the state is empty vs default. that might simplify this. If you select a compiler, the preset selection box should get set to the empty state.