Filter out system app when there are multiple active apps

[fr0l]

Issue:
on iOS 13 [FBXCAXClientProxy.sharedClient activeApplications] returns multiple entries (in my case - two).
And there are situations when the firstObject is SpringBoard - i.e. system application.
This prevents proper list of elements.

Fix:
Filter out system applications from list of activeApplications in case there are more than one item.

[fr0l]

the test testSettingsAppCanBeOpenedInScopeOfTheCurrentSession is a bit flaky. it should wait until event that the required application is active, and instead — now it just waits 5 seconds in this part of code:

  [[[FBRunLoopSpinner new]
    timeout:5]
   spinUntilTrue:^BOOL{
     return [FBXCAXClientProxy.sharedClient activeApplications].count == 1;
   }];

Locally, just to test, if I replace that spinUntilTrue with a simple sleep(5), then the test will pass 🤷‍♂

I've reverted the spin check (from what I've committed initially) (which is actually what it should be)

     return [FBXCAXClientProxy.sharedClient activeApplications].count > 0;

to what it was

     return [FBXCAXClientProxy.sharedClient activeApplications].count == 1;

(and now it actually sleeps 5 seconds, because the activeApplications.count is > 1 for iOS 13 when switching back and forth from applications within one session)

and later might see how to make test testSettingsAppCanBeOpenedInScopeOfTheCurrentSession not flaky.

[mykola-mokhnach]

Perhaps, it makes sense to change the test itself depending on the iOS version?

[fr0l]

ideally, test should not depend on iOS version. anyway, it's a separate issue.

[mykola-mokhnach]

and now it actually sleeps 5 seconds, because the activeApplications.count is > 1 for iOS 13 when switching back and forth from applications within one session

I don't like this fact very much. Is there any way to reduce the delay?

[mykola-mokhnach]

Let's merge this PR for now. I'll create a separate issue for 5 seconds delay.

[fr0l]

and now it actually sleeps 5 seconds, because the activeApplications.count is > 1 for iOS 13 when switching back and forth from applications within one session

I don't like this fact very much. Is there any way to reduce the delay?

@mykola-mokhnach Yes, i also didn't like the fact that it sleeps for 5 seconds. that's why I've changed the comparison from == 1 to > 0. (it was kind of a quick fix)

I think it's good to determine requirements here and edge cases.

• One of edge cases is that in iOS 13 there might be 2 applications active (one of them is system app. I don't know is it a iOS Beta bug or not. we'll see shortly with Xcode GoldenMaster)
• Also I haven't looked yet into iPad and it's split screen view — with split screen view the list activeApplications should contain more that one.