elm.swallow.background part will be a default part for
widget's background image.
entry: add elm.swallow.background part to all of groups
Revert my previous update. It was a mistake. :(
Please don't change previous ones.
Invert the dependency. elm.swallow.background -> bg.
Revert a changes on "bg" part and change relative dependency for parts.
@Hermet: can you accept and close this revision ?