[AC-3151] A new thread is created for each launch of the application, even it is in background (1 tap on Icon = 1 new activity)

The following usecase reproduces the issue:

Titanium.UI.setBackgroundColor('#000');

var tabGroup = Titanium.UI.createTabGroup();

var win1 = Titanium.UI.createWindow({  
    title:'Tab 1',
    backgroundColor:'#fff'
});
var tab1 = Titanium.UI.createTab({  
    title:'Tab 1',
    window:win1
});

var label1 = Titanium.UI.createLabel({
	color:'#999',
	text:'I am Window 1',
	font:{fontSize:20,fontFamily:'Helvetica Neue'},
	textAlign:'center',
	width:'auto'
});

win1.add(label1);

var win2 = Titanium.UI.createWindow({  
    title:'Tab 2',
    backgroundColor:'#fff'
});
var tab2 = Titanium.UI.createTab({  
    title:'Tab 2',
    window:win2
});

var label2 = Titanium.UI.createLabel({
	color:'#999',
	text:'I am Window 2',
	font:{fontSize:20,fontFamily:'Helvetica Neue'},
	textAlign:'center',
	width:'auto'
});

win2.add(label2);

tabGroup.addTab(tab1);  
tabGroup.addTab(tab2);  

tabGroup.open();

First time taping on the application Icon: the application starts like it should. Then, when taping the icon from dashboard or from application list: A new thread (activity) is started within the already existing application process, each time! The taskscreen is not affected by this: it brings the app to foreground like expect The expected behavior is: Bringing application to foreground, instead of running new activities. Changes were "debuggable=true" in AndroidManifest.xml, so I can track the thread activity, fastdev has also been disabled. I set launchmode:singleTop manually in AndroidManifest, but didn't help. Picture of DDM with multiple threads has been included, along with DDM log output. This bug is critical, each time new threads are created the memory consumption increases which finally leads to application crash.