[MM-17069]also unread the given post (#11932)

api4/post_test.go

@@ -2686,7 +2686,7 @@ func TestSetChannelUnread(t *testing.T) {
 		checkHTTPStatus(t, r, 200, false)
 		unread, err := th.App.GetChannelUnread(c1.Id, u1.Id)
 		require.Nil(t, err)
-		assert.Equal(t, int64(1), unread.MsgCount)
+		assert.Equal(t, int64(2), unread.MsgCount)
 	})
 
 	t.Run("Unread on a private channel", func(t *testing.T) {
@@ -2694,12 +2694,12 @@ func TestSetChannelUnread(t *testing.T) {
 		assert.Equal(t, 200, r.StatusCode)
 		unread, err := th.App.GetChannelUnread(th.BasicPrivateChannel.Id, u1.Id)
 		require.Nil(t, err)
-		assert.Equal(t, int64(0), unread.MsgCount)
+		assert.Equal(t, int64(1), unread.MsgCount)
 		r = th.Client.SetPostUnread(u1.Id, pp1.Id)
 		assert.Equal(t, 200, r.StatusCode)
 		unread, err = th.App.GetChannelUnread(th.BasicPrivateChannel.Id, u1.Id)
 		require.Nil(t, err)
-		assert.Equal(t, int64(1), unread.MsgCount)
+		assert.Equal(t, int64(2), unread.MsgCount)
 	})
 
 	t.Run("Can't unread an imaginary post", func(t *testing.T) {