Suggestion: Mark tiles at the bottom of the screen as being "attached" to other tiles before said other tiles come onto the screen. It's very annoying when I s

Suggestion: Mark tiles at the bottom of the screen as being "attached" to other tiles before said other tiles come onto the screen. It's very annoying when I see a useful tile which is not attached to anything and I reach over to grab it, only to have it become attached to something in the mean time. (Especially if that tile was one I created by merging two other tiles together and so its attachment to anything else should have been broken.)