The (FIR) Finite Impulse Response by John Elhers was kindly coded by Vladamir and re-coded as a non-repainting indicator by Mladen a few years ago.

Although it may not look like something very interesting, it deserves a place in our Ehlers' Thread for those who are followers of his teachings.
It is noted that John Ehlers favorite FIR filter had 1, 2, 3, 3, 2, 1, 0 coefficients.

As explained by Vlad:
This moving average smooths the prices of the selected digital filter. In fact, the filter is the same (ideal low pass filter), and there are several approximations of its impulse response. These approximations are selected by the Window input variable.

Attached below is the indicator and also the article which talks about Non Linear Filters.