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TechDraw: avoid touching children if possible
There are lots of dependency inversion problem in TechDraw, the ideal organization should let a child depend on project group, instead of the other way round, e.g. using PropertyLinkListHidden. This patch is just a cheap fix. The problem occurs when the user uses any expression to update properties like Scale in a projection group. The Scale property will be changed on recomputing projection group, which triggers children update, but since the group depends on the children, the children has already been recomputed.
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