We have seen that magnetism doesn't allow to stretch surface filters or treatments. The
Expand... commands allow to apply the magnetism to stretching.
This menu allows to stretch a surface filter or treatment.
Grids, markers or treatments must be displayed in the window to activate the magnetism.
Previous marker or step : the item will be stretched if its beginning was not aligned on a marker. Once the item is streched to the previous marker, it can't be stretched again.
Next marker or step : the item will be stretched as many times as required.
Items can be stretched to the next treatment only. Treatment include surface filters and snippets.