Active parameter for the signature of a FROM with build stages

[rcjsuen]

Correct parameter:

Incorrect parameter (tag):

Incorrect parameter (digest):

When the signature is calculated for a FROM instruction that is using build stages with an AS, the active parameter is off in the signature with tags and digests. The same thing happens when the parameter is on the stage parameter. The AS parameter gets highlighted in the tag and digest signatures instead of the stage parameter.

Since the active parameter has to match all the signatures, it seems like we need to add an empty parameter into the first signature so that the offsets will match.