public void replaceKeyValueDelimiterWithDefault() {
    PropertyImpl property = (PropertyImpl)PropertiesElementFactory.createProperty(getProject(), "yyy", "xxx", null);
    final ASTNode newDelimiter = property.getNode().findChildByType(PropertiesTokenTypes.KEY_VALUE_SEPARATOR);
    final ASTNode propertyNode = getNode();
    final ASTNode oldDelimiter = propertyNode.findChildByType(PropertiesTokenTypes.KEY_VALUE_SEPARATOR);
    if (areDelimitersEqual(newDelimiter, oldDelimiter)) {
      return;
    }
    if (newDelimiter == null) {
      propertyNode.replaceChild(oldDelimiter, ASTFactory.whitespace(" "));
    } else {
      if (oldDelimiter == null) {
        propertyNode.addChild(newDelimiter, getValueNode());
        final ASTNode insertedDelimiter = propertyNode.findChildByType(PropertiesTokenTypes.KEY_VALUE_SEPARATOR);
        LOG.assertTrue(insertedDelimiter != null);
        ASTNode currentPrev = insertedDelimiter.getTreePrev();
        final List<ASTNode> toDelete = new ArrayList<>();
        while (currentPrev != null && currentPrev.getElementType() == PropertiesTokenTypes.WHITE_SPACE) {
          toDelete.add(currentPrev);
          currentPrev = currentPrev.getTreePrev();
        }
        for (ASTNode node : toDelete) {
          propertyNode.removeChild(node);
        }
      } else {
        propertyNode.replaceChild(oldDelimiter, newDelimiter);
      }
    }
  }
public void replaceKeyValueDelimiterWithDefault()