Once validating a process, if any validation error happens, the alerts panel gets populated with some messages and the invalid nodes/connectors (in the canvas) are also highlighted with red borders.

Once saving a process, which process also implies validation, if any validation error happens, the alerts panel gets populated as well, but the nodes/connectors get only highlighted for short period of time, this way also, after some seconds, nothing is being highlighted.

This has been tested on the process editor, but this feature is generic in Stunner, and also applies to other domains, like DMN.

Attaching reproducer video, see also Steps Tto Reproduce section