Fix queue worker incorrectly stopped when there are still more items in the queue (#29532)

Without `case <-t.C`, the workers would stop incorrectly, the test won't
pass. For the worse case, there might be only one running worker
processing the queue items for long time because other workers are
stopped. The root cause is related to the logic of doDispatchBatchToWorker.
It isn't a serious problem at the moment, so keep it as-is.

(cherry picked from commit 6465f94a2d26cdacc232fddc20f98d98df61ddac)

modules/queue/workerqueue_test.go

@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/test"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -175,11 +176,7 @@ func testWorkerPoolQueuePersistence(t *testing.T, queueSetting setting.QueueSett
 }
 
 func TestWorkerPoolQueueActiveWorkers(t *testing.T) {
-	oldWorkerIdleDuration := workerIdleDuration
-	workerIdleDuration = 300 * time.Millisecond
-	defer func() {
-		workerIdleDuration = oldWorkerIdleDuration
-	}()
+	defer test.MockVariableValue(&workerIdleDuration, 300*time.Millisecond)()
 
 	handler := func(items ...int) (unhandled []int) {
 		time.Sleep(100 * time.Millisecond)
@@ -250,3 +247,25 @@ func TestWorkerPoolQueueShutdown(t *testing.T) {
 	q, _ = newWorkerPoolQueueForTest("test-workpoolqueue", qs, handler, false)
 	assert.EqualValues(t, 20, q.GetQueueItemNumber())
 }
+
+func TestWorkerPoolQueueWorkerIdleReset(t *testing.T) {
+	defer test.MockVariableValue(&workerIdleDuration, 10*time.Millisecond)()
+
+	handler := func(items ...int) (unhandled []int) {
+		time.Sleep(50 * time.Millisecond)
+		return nil
+	}
+
+	q, _ := newWorkerPoolQueueForTest("test-workpoolqueue", setting.QueueSettings{Type: "channel", BatchLength: 1, MaxWorkers: 2, Length: 100}, handler, false)
+	stop := runWorkerPoolQueue(q)
+	for i := 0; i < 20; i++ {
+		assert.NoError(t, q.Push(i))
+	}
+
+	time.Sleep(500 * time.Millisecond)
+	assert.EqualValues(t, 2, q.GetWorkerNumber())
+	assert.EqualValues(t, 2, q.GetWorkerActiveNumber())
+	// when the queue never becomes empty, the existing workers should keep working
+	assert.EqualValues(t, 2, q.workerStartedCounter)
+	stop()
+}