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//set a flag just before the initial load,

var initializing = true
//and then when the first $watch fires, do

$scope.$watch('fieldcontainer', function() {
  if (initializing) {
    $timeout(function() { initializing = false; });
  } else {
    // do whatever you were going to do
  }
});
//The flag will be tear down just at the end of the current digest cycle, so next change won't be blocked.