Fix bug where const assignments could be lost in some disallowed const scenarios #643
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mkorbel1
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Description & Motivation
There was a rare bug where if "disallowed" constant signals were assigned to parts/slices of constant signals, and assignment collapsing order got unlucky, sometimes a constant assignment could be lost. This PR fixes the bug.
Related Issue(s)
N/A
Testing
Added new tests, plus existing tests cover nothing broke
Backwards-compatibility
No
Documentation
No