This seems to be a bug in Cairo caused by drawing the selection path as a dashed outline.
If you comment out line ~188 in PintaCanvas.cs:
g.SetDash (new double[] { 2 / scale, 4 / scale }, 0);
Then the streaks no longer appear, but of course the selection is outlined either.
This seems to be a bug in Cairo caused by drawing the selection path as a dashed outline.
If you comment out line ~188 in PintaCanvas.cs:
g.SetDash (new double[] { 2 / scale, 4 / scale }, 0);
Then the streaks no longer appear, but of course the selection is outlined either.