fix(android): improve Window focus/blur events

[m1ga]

Will fire blur/focus event when you drag down the statusbar on your phone.

Note: This will also fire when an alert is shown! That is currently not the case. So I'm not sure if we should use a different event for this as it may cause problems in existing apps.

var win = Ti.UI.createWindow({});
var btn = Ti.UI.createButton({
	title: "alert",
})

win.add(btn);
win.open();

win.addEventListener("focus", function(){
	console.log("win focus")
})
win.addEventListener("blur", function(){
	console.log("win blur")
})

btn.addEventListener("click", function(e) {
	alert(1);
})

I could change it to windowblur and windowfocus so you have a different event for these new blur/focus and it won't break any exisint blur/focus usage on a window

[hansemannn]

How does iOS behave here, especially for alerts? IIRC, it also fires blur/focus events prior/after showing alerts.

[m1ga]

need to check that on iOS.

Since an alert would fire a blur event on Android after that change it might be better to give it a different event name in case iOS doesn't do that. Otherwise it might fire blur in cases you don't want it because it is just showing an alert. But I'll test it on iOS next week and check how the events line up.

[m1ga]

running the example code with the current main (not using this PR) on iOS and Android:

• iOS: blur/focus is fired already when opening/closing the alert
• Android: no events when opening/closing the alert

so this PR will actually make Android behave the same way as iOS is doing right now