Stroke eraser function

@@ -453,0 +462,4 @@
+    IndexMask strokes_to_remove = IndexMask::from_predicate(
+        src.curves_range(), GrainSize(256), memory, [&](const int64_t src_curve) {
+          const IndexRange src_curve_points = src_points_by_curve[src_curve];
+          BLI_assert(src_curve_points.size() > 0);

@@ -453,0 +468,4 @@
+          for (const int src_point : src_curve_points.drop_back(1)) {
+            float mu0;
+            float mu1;
+            if (intersections_with_segment(screen_space_positions[src_point],

@@ -453,0 +493,4 @@
+          /* If there is no intersection with the stroke path, then either all points lie inside
+           * the eraser, or none of them. Thus, checking for the first point should be enough.
+           */
+          return contains_point(screen_space_positions[src_curve_points.first()]);

@@ -453,0 +474,4 @@
+              return true;
+            }
+          }
+