Filter out spaces from various free form preferences boxes

[vkbo]

Make sure the user cannot accidentally add space characters to certain settings, including the auto-padding one. This would probably

I think I know what's going on. Do you have this setting enabled?

You probably have a space in the boxes, so the editor inserts non-breaking spaces around your regular spaces.

This setting should probably not allow spaces in the values. I'll look into adding a check for that.

Originally posted by @vkbo in #1984 (reply in thread)