Does this dashed line in this situation indicate a place to stop because of the "stop" sign?

Why?

The row of rectangles before the zebra crossing is the P-14 conditional stop line. Here it marks where to stop when the situation at the pedestrian crossing requires it. Stopping there does not replace the mandatory stop at the appropriate location for the B-20 STOP sign.

§ 89 ust. 3 pkt 2 oraz § 21 ust. 1 i 2 rozporządzenia w sprawie znaków i sygnałów drogowych