Three new widgets, a smoother pull to refresh, and fixes for reported issues (Preview)

This release adds ReorderableListView, TabBar with TabBarView, and
NestedScrollView, all on native views. Pull to refresh takes an
indicator of your own in both styles and moves as one motion on iPhone.
It fixes the issues you reported on the public repo: #50, #52, #53, #55
and #56, plus a webview report from a Firebase user.

To get it, run dn upgrade. On an older dn, that prints the install
command for your system: run it, then dn upgrade again.

Code push: every framework build is a new build for code push. After
dn upgrade, fixes you send reach only apps released with this build, so
make a new release before sending fixes. With the new dn, a fix can add
a new top-level function or static method to a file it changes; a fixed
function in the same file can call it.

Two plugins have new versions: dartnative_share 1.0.1 and
dartnative_webview 1.0.1. Run dn pub upgrade in your app to get them.

New widgets

• ReorderableListView. Drag rows into a new order with the
  platform's own reordering: drag and drop or the reorder control on
  iPhone, the touch helper on Android. It is compatible with Flutter's
  ReorderableListView API, onReorder included. Along with it, Card
  takes an optional child, compatible with Flutter's Card.
• TabBar and TabBarView. Tabs under the app bar with swipeable
  pages. AppBar.bottom hosts the bar, TabController and
  DefaultTabController drive it, and the indicator follows a swipe
  natively. On Android the strip is Material's own.
• NestedScrollView. A collapsing app bar over a scrolling body:
  the SliverAppBar header collapses, floats and snaps with the body's
  scroll. SliverAppBar is compatible with Flutter's SliverAppBar
  parameters, all of them, and
  SliverOverlapAbsorber, SliverOverlapInjector and
  SliverFixedExtentList are there.

Pull to refresh

• Draw your own indicator. Give RefreshIndicator a builder in the
  default pull-down style and the platform's spinner steps aside: the
  content still follows the finger, and your builder gets the pull's
  phase and distance through the refresh and the way back. Use
  PullDownIndicator with a child for a logo or an animated icon that
  rides with the content, or draw the band yourself. PullOverIndicator
  takes a child in the spinner's place too.
• One motion on iPhone. The release settles onto the hold with a
  spring, a refresh that ends during the settle carries straight on into
  the way back, and the content comes back over 0.4 s on the standard
  ease. Your indicator rides the content the whole way.
• The playground's TikTok feed shows both: animated dots in the
  pull-over style, and a switch in its tab row to try pull down.

Fixed

• Native controls run your latest callback. FloatingActionButton,
  Switch, SegmentedControl, Slider, BottomNavigationBar,
  Checkbox and Radio kept the callback from their first build. (#52)
• A horizontal drag in a list row leaves the list scrolling. A
  GestureDetector that only listens sideways no longer stops the list's
  vertical scroll on iPhone. (#55)
• A dropdown declared with a type argument reports its choice.
  DropdownButton<String> lost its onChanged in a type check. Control
  callbacks that throw now print the exception instead of swallowing it.
• Android release builds have network access without editing the
  manifest: the framework declares the INTERNET permission itself. New
  apps target Android 8.0 (API 26) and later; an existing app keeps the
  minimum its own build file names. (#50)
• iPhone screens keep updating while the app runs a burst of work. A
  feed that rebuilt its pages while their players started could freeze
  for half a second with the app still responsive. Frames now reach the
  screen within one frame of being ready, whatever the app does next.
• A jump to the top of a list no longer cuts its bounce on iPhone.
• A SizedBox that starts without a child shows the child you give it
  later. A box built with child: null and rebuilt with a child kept
  its size and stayed empty. (#56)
• A bar at the very bottom of an iPhone screen stays visible. An app
  that sets a navigation bar colour had that colour painted over its own
  content under the home indicator; the colour now sits behind the app,
  as it does on Android.

Plugins

• dartnative_webview 1.0.1: NavigationDelegate.onNavigationRequest
  now decides each navigation before it loads, on both platforms, and a
  Future decides later. A sign-in flow that returns to your app through
  its own scheme reaches your code instead of leaving a blank page.
  NavigationRequest carries isMainFrame.
• dartnative_share 1.0.1: sharing from a sheet that is closing
  works; the share sheet lives in a window of its own. (#53)

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Build: SDK 4c1cdb074e0 · engine 868544bccad6. Install or update: curl -fsSL https://cdn.dartnative.com/install.sh | sh