Remove impromptu 'trigger change' functionality from UiBuilder

Now values to computed questions and visibility of questions in
conditions are manuaaly set instead of triggering an needless
visit of the form object. Also fixes the broken unit tests.

src/main/java/nl/uva/softwcons/ql/eval/Evaluator.java

@@ -21,6 +21,8 @@ public class Evaluator implements FormVisitor<Void>, StatementVisitor<Void> {
     public Evaluator(final Form form) {
         this.answers = new FormAnswers();
         this.referencesResolver = new ReferenceResolver(form);
+
+        form.accept(this);
     }
 
     public Value getValue(final Identifier variable) {

src/main/java/nl/uva/softwcons/ql/ui/UiBuilder.java

@@ -47,8 +47,6 @@ public FormLayout visit(final Form form) {
 
         questionLayouts.forEach(layout -> formLayout.add(layout));
 
-        form.accept(evaluator);
-
         return formLayout;
     }
 
@@ -58,6 +56,7 @@ public List<QuestionLayout> visit(final ComputedQuestion question) {
         final Widget questionWidget = this.widgetFactory.getWidget(question);
         layout.add(questionWidget.getWidget());
 
+        questionWidget.setValue(evaluator.getValue(question.getId()));
         evaluator.addListener(question, (newValue) -> {
             questionWidget.setValue(newValue);
         });
@@ -83,6 +82,7 @@ public List<QuestionLayout> visit(final Conditional conditional) {
         final List<QuestionLayout> layouts = visitAndFlatten(conditional.getQuestions());
 
         layouts.forEach(layout -> {
+            layout.setVisible(evaluator.getValue(conditional).inConditionalContext());
             evaluator.addListener(conditional, (value) -> {
                 layout.setVisible(value.inConditionalContext());
             });