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is a symbol whose value is True if it is evaluated as part of the evaluation of a Dynamic.
Detect whether an evaluation is occurring inside Dynamic:
The evaluations are inside a Dynamic for Manipulate:
A function that returns messages causes Dynamic values to pink:
Use $DynamicEvaluation to print the message in regular evaluations while suppressing the pink box in Dynamic:
$ControlActiveSetting ControlActive $SynchronousEvaluation PreemptProtect DynamicUpdating