misc: don't add same edge insn several times

jadx-core/src/main/java/jadx/core/dex/attributes/nodes/EdgeInsnAttr.java

 package jadx.core.dex.attributes.nodes;
 
+import java.util.Objects;
+
 import jadx.core.dex.attributes.AType;
 import jadx.core.dex.attributes.AttrList;
 import jadx.core.dex.attributes.IAttribute;
@@ -14,9 +16,13 @@ public class EdgeInsnAttr implements IAttribute {
 
 	public static void addEdgeInsn(BlockNode start, BlockNode end, InsnNode insn) {
 		EdgeInsnAttr edgeInsnAttr = new EdgeInsnAttr(start, end, insn);
+		if (!start.getAll(AType.EDGE_INSN).contains(edgeInsnAttr)) {
 			start.addAttr(AType.EDGE_INSN, edgeInsnAttr);
+		}
+		if (!end.getAll(AType.EDGE_INSN).contains(edgeInsnAttr)) {
 			end.addAttr(AType.EDGE_INSN, edgeInsnAttr);
 		}
+	}
 
 	public EdgeInsnAttr(BlockNode start, BlockNode end, InsnNode insn) {
 		this.start = start;
@@ -42,6 +48,25 @@ public class EdgeInsnAttr implements IAttribute {
 	}
 
 	@Override
+	public boolean equals(Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (o == null || getClass() != o.getClass()) {
+			return false;
+		}
+		EdgeInsnAttr that = (EdgeInsnAttr) o;
+		return start.equals(that.start)
+				&& end.equals(that.end)
+				&& insn.isDeepEquals(that.insn);
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(start, end, insn);
+	}
+
+	@Override
 	public String toString() {
 		return "EDGE_INSN: " + start + "->" + end + ' ' + insn;
 	}