Change: Shortcut varaction chains for callbacks. #9289
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Motivation / Problem
By design, an unhandled callback often ends up following the default graphics chain. Depending on the variables accessed this could potentially be expensive.
Description
If a varaction chain does contain any callback results, do not continue evaluating the chain. This possibly avoids processing complex graphical chains which can never end in a callback result.
Limitations
This is not really benchmarked and is hypothetical at this point. It's not impossible that the additional test causes more work over all.
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.