Z value for drawing#150
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SimonRohou
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Explanations are in the all_commands.cpp :
Default ZValue is 0
ZValues have to be seen as a tree structure:
In definitive, Qt looks at the lowest ZValue group (or solo item), then draws it or all its items by ascending ZValue order,
then goes to the second lowest ZValue group, etc.
The latest item to be drawn shows on top