material_3_demo: NavigationRail trailing has expaneded

[fredgrott]

The NavigationRail trailing has an Expanded Widget as parent however that will cause problems when window changes to small sizes. Would it not be better to use Flexible? Such as:

navigationRail: NavigationRail( extended: showLargeSizeLayout, trailing: Flexible( fit: FlexFit.loose, child: Padding( padding: const EdgeInsets.only(bottom: 20), child: showLargeSizeLayout ? _expandedTrailingActions() : _trailingActions(), ), ), destinations: navRailDestinations, selectedIndex: screenIndex, // // ignore: prefer-extracting-callbacks onDestinationSelected: (index) { setState(() { screenIndex = index; handleScreenChanged(screenIndex); }); }, ),

Fixes the problem as we would not use a scroillview here as we do not want the scrollbar appearing on the NavigationRail content.

I only found this as I was exploring this better approach to hand writing adaptive scaffolds rather than the flutter adaptive scaffold as I can get more design power in custom creating the transition animation and other animations.

Very good work thus far, peace and happy designing.

[domesticmouse]

PTAL @QuncCccccc @guidezpl