Post window doesn't fade out when it has focus. So, "Focus Post Window" can be used to show the post window quickly, and it won't disappear on you if you, for example, drag it.
Fixed: When no splits are present, editor window alpha is not updated on document switch. Now, we switch active appearance every time the editor is swapped out, not just when it's newly created.
Move window activate to hacks to avoid Cocoa include.