Automatic attachment position

[VladimirAnaniev]

Feature request for automatically positioning the attachment based on available space.
The option could be attachment: 'auto' or attachment: 'auto auto' for fully automatic positioning.
Or for finer control attachment: 'auto left' to position the attachment on the left but depending on available space shift between top, middle and bottom.

[RobbieTheWagner]

@VladimirAnaniev I really like this idea! If you have thoughts on an implementation, we could certainly use the help 😃