core: new timeout only if no activity in progress

[andi34]

fix #272

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• I have read the contributing guidelines.

What is the purpose of this pull request? (put an "x" next to an item)

• Documentation update
• Bug fix
• New feature
• Other, please explain:

What changes did you make? (Give an overview)

Reset the timeout to return to Startpage every second of the Countdown.

[jacques42]

I think it actually won't fix the issue. Reason being I believe is that the resetTimeOut function cancels an existing timeout BUT then starts a new timeout. And then if the timeout time is reasonably short, it will reload the page even if there is something in progress (picture, collage).

photobooth/src/js/core.js

Lines 68 to 75 in 8d1215c

	// timeOut function
	api.resetTimeOut = function () {
	clearTimeout(timeOut);
	timeOut = setTimeout(function () {
	api.reloadPage();
	}, timeToLive);
	};

The bug will always kick-in where the timeout to reload the page is smaller than the time it takes to process a current activitiy end to end.

I think we should update the resetTimeOut to check whether or not an activity is in progress.