I got it. Let me know if you need the solution.
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2. When a TrendLine line is deleted by program using "ObjectDelete()", MT5 puts a CHARTEVENT_OBJECT_DELETE into the queue.
While processing the queue in OnChartEvent(CHARTEVENT_OBJECT_DELETE) , do I have a chance to distinguish whether the line was deleted by 1. or 2. ?
Thanks
Willbur