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If the immediate upstream and downstream variables are not visible in the mapper tree (i.e. they need to be scrolled to), then the mapper trees should automatically scroll so that they are visible. Thus, not only are the upstream/downstream variables highlighted in bold, but they are also scrolled-to so that the user can easily see them when the activity is selected.
Most probably not for this release.
Resolving as WONTFIX in favor of issue 128646 and issue 134362. We'll implement filtering instead of auto-scrolling.