Impossible to use OnAfterConfigRead event, when there is a system preset for a given unit config

[Alexander Obuhovich]

It's impossible to use OnAfterConfigRead event, when there is a system preset for a given unit config.

For example this code in EUserEventHandler::OnAfterConfigRead method, used to make user's first name required:

$fields = $this->Application->getUnitOption($event->Prefix, 'Fields');

$fields['FirstName']['required'] = 1;

$this->Application->setUnitOption($event->Prefix, 'Fields', $fields);

has no effect, when current system preset (e.g. "simple" system preset) has "users_u.php" that resets all required fields anyway.

To solve that I'm proposing to apply system preset imposed changed before calling OnAfterConfigRead event. This way any code in OnAfterConfigRead even will override whatever system preset is imposing.

That's how it worked before system presets were invented.

Task: http://tracker.in-portal.org/view.php?id=1104

Ready for testing.

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