How to check the indicator is repaint.
The easy way is just to read buffer signals from the indicator.
Read Buy arrow signal and Sell arrow signal and put arrow on the chart.
This is Heiken Ashi indicator.
You will know it is repaint.
Below is TMA+CG mladen NRP indicator.
It looks OK (No repaint =NR) , but signal is always 1 candle stick delay.
Most of the indicator signal is 1 candle stick (CS) delay. Some indicators delay 2 or 3 CS.