code: function _navigateForward() {
          var navFrame = jumpForwardStack.pop();
          
          if (!navFrame) {
              return;
          }
          
          // Check if the poped frame is the current active frame or doesn't have any valid marker information
          // if true, jump again
          if (navFrame === currentEditPos) {
              jumpBackwardStack.push(navFrame);
              _validateNavigationCmds();
              CommandManager.execute(NAVIGATION_JUMP_FWD);
              return;
          }
          
          // We will check for the file existence now, if it doesn't exist we will jump back again
          // but discard the popped frame as invalid.
          _validateFrame(navFrame).done(function () {
              jumpBackwardStack.push(navFrame);
              navFrame.goTo();
              currentEditPos = navFrame;
          }).fail(function () {
              _validateNavigationCmds();
              CommandManager.execute(NAVIGATION_JUMP_FWD);
          }).always(function () {
              _validateNavigationCmds();
          });
          
      }
docs: Command handler to navigate forward