anchor.diff:                  rowContents: (tarBarControl.footerButton == null)
                       ? [Container()]
                       : tarBarControl.footerButton.length == 0
  -                        ? [SizedBox.fromSize(size: Size(100, 50),)]
  +                        ? [
  +                            SizedBox.fromSize(
  +                              size: Size(100, 50),
  +                            )
  +                          ]
                           : tarBarControl.footerButton),
             );
           },
  
positive.code: 
    GlobalKey<RepositoryDetailIssuePageState> issueListKey =
        new GlobalKey<RepositoryDetailIssuePageState>();
  
    List<String> branchList = new List();
  
  
negative.code:             onPageChanged: (index) {
                reposDetailModel.setCurrentIndex(index);
              },
              floatingActionButton: ScaleTransition(
                scale: CurvedAnimation(parent: animationController, curve: Curves.bounceIn),
                child: FloatingActionButton(
                  onPressed: () {
                    _createIssue();
                  },
                  child: Icon(Icons.add),
                  backgroundColor: Theme.of(context).primaryColor,
                ),
              ),
              floatingActionButtonLocation:
                  FloatingActionButtonLocation.endDocked,
  