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The message suppression feature on the message right-click menu does support what I think you are saying. You can select "Suppress Exact Selected Messages" to suppress a specific occurrence. So you can suppress the message about the specific stuck-at-GND signal while still seeing the similar messages for other signals.
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Honestly, I didn't know. I don't know why, but I assumed suppress manager was for a specific message type or class, and not for a specific occurrence.
It is still not nearly as useful as if you could do that at the RTL source level. For starters, some warning messages are associated with a specific line number and nothing else. So as soon as the line moves, the suppression is not working anymore. Furthermore, it is dangerous because it might suppress a warning in a different line (that now moved to the position of the original one) than the one you wanted. It would actually say it is a bug that Quartus accepts those messages as "suppressible".
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