Keep app above lock screen

[geekyouup]

What steps will reproduce the problem?

1. open app
2. click power button
3. click power button again

What is the expected output? What do you see instead?

What version of the product are you using? On what operating system?
app version 6.0.4

Please provide any additional information below.

When training I use the stopwatch and put the phone in my pocket (after turing the screen off). I have a lock screen with pin security. It is REALLY inconvenient to insert the pin each time I want to see the stopwatch.
The stopwatch activity should be on top of the lock screen.

In com.geekyouup.android.ustopwatch.UltimateStopwatchActivity.onResume() add the following line:
getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);

Add a Setting to control the execution of this line (place the above line in an 'if' block).

This feature is really really useful. Currently I'm comiling this app with this modification myself. I would love to use the Google Play apk if this feature is included.