fix: image gate reacts to ComfyUI Interrupt

GateBus.wait() only checked the gate's own Stop flag, so pressing ComfyUI's
Interrupt left the image gate blocked. Add should_cancel to wait() (mirroring
wait_payload) and pass mm.processing_interrupted from gate.py, matching the
text gate.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

gates/gate.py

@@ -47,13 +47,14 @@ class ImageGate:
     def run(self, image, routes, unique_id):
         from comfy_execution.graph_utils import ExecutionBlocker
         from . import gate_server
+        import comfy.model_management as mm
 
         gate_bus.GateBus.arm(unique_id)
         gate_server.send_preview(unique_id, image, routes)
         try:
-            chosen_1 = gate_bus.GateBus.wait(unique_id)
+            chosen_1 = gate_bus.GateBus.wait(
+                unique_id, should_cancel=mm.processing_interrupted)
         except gate_bus.GateCancelled:
-            import comfy.model_management as mm
             raise mm.InterruptProcessingException()
 
         mask = mask_from_stash(gate_bus.GateBus.pop_mask(unique_id), image)

gates/gate_bus.py

@@ -27,10 +27,10 @@ class GateBus:
             cls.messages[str(node_id)] = int(message)
 
     @classmethod
-    def wait(cls, node_id, period=0.1):
+    def wait(cls, node_id, period=0.1, should_cancel=None):
         sid = str(node_id)
         while sid not in cls.messages:
-            if cls.cancelled:
+            if cls.cancelled or (should_cancel is not None and should_cancel()):
                 cls.cancelled = False
                 raise GateCancelled()
             time.sleep(period)

tests/test_gate_bus.py

@@ -65,3 +65,10 @@ def test_wait_payload_should_cancel_raises():
     gb.GateBus.arm("p")
     with pytest.raises(gb.GateCancelled):
         gb.GateBus.wait_payload("p", should_cancel=lambda: True)
+
+def test_wait_should_cancel_raises():
+    # image gate: ComfyUI Interrupt (should_cancel) must abort the wait too
+    gb.GateBus.arm("7")
+    with pytest.raises(gb.GateCancelled):
+        gb.GateBus.wait("7", should_cancel=lambda: True)
+    assert gb.GateBus.cancelled is False