[Magic-dev] Illegal overlaps not flagged

[Bertrand Irissou]

 Hi Tim,
 
 I think I ran into a rather big bug...
 If you have to cells each with different paint on the same plane, 
overlapping them when included in a parent cell will not flag a problem....
 
 For instance, using scmos:
 Paint nwell in cellA, paint pwell in cellB.
 getcell cellA and cellB in a cellC. Overlap them. No error gets flagged.
 I am using version 7.4.27.
 I think this must be a bug as the code for checking is still there and 
this used to be standard behavior in version 6.4 or 7.2 (which I have 
used a lot in the past).

 Thanks,
 
 Bertrand.
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