20160824, sprite image size increase beyond stage size possible

[heppg]

same in legacy, so it is an improvement: sprite editor, create a text with some chars, say 20-40 chars. Then set font size to extreme. Reduce font size to original value. The sprite keeps the large dimension (without need). When now importing another sprite into the editor, it is placed in the center of diemsnsions, which is far out the drawable range in stage.