--fanout: leave out pins a same-net pour on their layer already joins

src/freeroute/route/fanout.py

@@ -57,6 +57,12 @@ def plan_fanout(board: BasicBoard, rules: FanoutRules) -> list:
     for z in board.get_conduction_areas():
         if z.net_nos and not board.layer_structure.arr[z.layer].is_signal:
             planes.setdefault(z.net_nos[0], []).append(z)
+    # copper pours on the routing layers, by net: a pad inside one is joined
+    # by the fill, and a stub there would take the room its thermal spokes need
+    pours: dict[int, list] = {}
+    for z in board.get_conduction_areas():
+        if z.net_nos and board.layer_structure.arr[z.layer].is_signal:
+            pours.setdefault(z.net_nos[0], []).append(z)
     placed = _Placed(board, rules)
     by_net: dict[int, list[Pin]] = {}
     for pin in board.get_pins():
@@ -73,6 +79,9 @@ def plan_fanout(board: BasicBoard, rules: FanoutRules) -> list:
             if net is None:
                 continue
             layer = next(layer for layer in pin.layers if layer in rules.signal_layers)
+            if any(z.layer == layer and z.polygon is not None and z.polygon.contains(pin.location)
+                   for z in pours.get(net, [])):
+                continue  # the pour joins it
             direction = _outward(pin.location, centre)
             reach = _pad_reach(pin, direction) + rules.clearance + half + rules.trace_width
             end = _step(pin.location, direction, reach)