Clip small linewidths in agg

timhoffm · timhoffm · commit ed7f647d81bd · 2019-06-16T20:43:04.000+02:00
diff --git a/src/_backend_agg.h b/src/_backend_agg.h
@@ -406,6 +406,11 @@ RendererAgg::_draw_path(path_t &path, bool has_clippath, const facepair_t &face,
         double linewidth = points_to_pixels(gc.linewidth);
         if (!gc.isaa) {
             linewidth = (linewidth < 0.5) ? 0.5 : mpl_round(linewidth);
+        } else {
+            // Too small linewidths are clipped because they require a lot of
+            // computation and do not make sense even with antialiasing.
+            // Compare github #14498.
+            linewidth = (linewidth < 0.01) ? 0.01 : mpl_round(linewidth);
         }
         if (gc.dashes.size() == 0) {
             stroke_t stroke(path);
