[wpilib] Shuffleboard: Keep duplicates on SelectTab() (#5198)

wpilibc/src/test/native/cpp/shuffleboard/ShuffleboardInstanceTest.cpp

@@ -7,6 +7,8 @@
 #include <string_view>
 
 #include <networktables/NetworkTableInstance.h>
+#include <networktables/NetworkTableListener.h>
+#include <networktables/StringTopic.h>
 
 #include "frc/shuffleboard/ShuffleboardInstance.h"
 #include "gtest/gtest.h"
@@ -106,3 +108,22 @@ TEST(ShuffleboardInstanceTest, NestedActuatorWidgetsAreDisabled) {
   EXPECT_FALSE(controllable)
       << "The nested actuator widget should have been disabled";
 }
+
+TEST(ShuffleboardInstanceTest, DuplicateSelectTabs) {
+  NTWrapper ntInst;
+  frc::detail::ShuffleboardInstance shuffleboardInst{ntInst.inst};
+  std::atomic_int counter = 0;
+  auto listener = nt::NetworkTableListener::CreateListener(
+      ntInst.inst.GetStringTopic("/Shuffleboard/.metadata/Selected"),
+      nt::EventFlags::kValueAll | nt::EventFlags::kImmediate,
+      [&counter](auto& event) { counter++; });
+
+  // There shouldn't be anything there
+  EXPECT_EQ(0, counter);
+
+  shuffleboardInst.SelectTab("tab1");
+  shuffleboardInst.SelectTab("tab1");
+  EXPECT_TRUE(ntInst.inst.WaitForListenerQueue(0.005))
+      << "Listener queue timed out!";
+  EXPECT_EQ(2, counter);
+}