AHa, that problem. Yesh, I had that once before with my XD, but I immediately noticed something was off because i wanted to reboot it, and it did not respond to the normal 3 second press. Also I saw the blacklight was still on. So I pushed it 7 seconds (I knew this from my q9, where I also had it once like 4 months ago, and I believe my archos gamepad 2 did it too once), it went off for real, then I turned it back on again normally. No damage at all.
I can imagine tough that ignoring it and letting it lay there like that for a few hours might cause some damage.
But, to summarize:
You can turn of and on device while in charger. but, IF the blacklight stays on when you try to turn it off while charging , immediately push the power button for 7 seconds. You will see the blacklight go off so you know it?s long enough. Do not ignore it and let it charge like that for any period of time, it might damage the screen.
And I had the same issue once on my q9, so from experience I can say that most likely the issue happens with the Q9 as well. It happens very rarely, usually when in charger it will turn off correctly, but if it does not, immediately press that button for 7 seconds and there should be no problem.
Off course, I just let it charge in standby. Much saver.
Now to be sure, am I right in believing that an app crash or android crash while in standby and charging (so I am not ever there, maybe not even home) can never result in this happening? Android always does a full reboot when it crashes right?