Differencing: Locking of size/position and/or content.
It takes some time to define the exact time and size of elements if you lock this position it is also impossible to edit content etc. of the item.
If you unlock it to make some changes: the position is easily spoilt by mouse moves.
It would be very helpful, if there would be two options/kinds of locks: Size/Position and Content. (similar to many layout programs like indesign, pagemaker or scribus)
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