title: Getting Incorrect use of ParentDataWidget error when I use ListView
body: <p>In this part of my application I have <code>ListView</code>, when I run app I get this error and I can't resolve that:</p>
  <pre><code>Scaffold(
    body: Directionality(
  textDirection: TextDirection.rtl,
  child: Container(
    child: StreamBuilder(
      stream: globals.database.ticketsDao.getTicketsStream(),
      builder: (BuildContext context, AsyncSnapshot&lt;List&lt;Tickets&gt;&gt; snapshot) {
        if (snapshot.hasData) {
          return Column(
            children: &lt;Widget&gt;[
              Expanded(
                child: ListView.separated(
                    itemBuilder: (context, index) {
                      return ListTile(
                        title: Flexible(
                          child: Text(
                            snapshot.data[index].subject,
                            style: Theme.of(context).textTheme.caption.copyWith(fontFamily: 'IranSansBold'),
                          ),
                        ),
                        subtitle: Text(
                          snapshot.data[index].description,
                          style: Theme.of(context).textTheme.caption.copyWith(fontFamily: 'IranSansLight'),
                        ),
                      );
                    },
                    separatorBuilder: (context, index) {
                      return Divider();
                    },
                    itemCount:  snapshot.data.length),
              ),
            ],
          );
        } else {
          return Container(
              child: Center(
            child: Text(
              Strings.notAnyTickets,),
            ),
          ));
        }
      },
    ),
  ),
  ));
  </code></pre>
  <p>error:</p>
  <pre class="lang-none prettyprint-override"><code>══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════  
  The following assertion was thrown building DefaultTextStyle(debugLabel:
  ((englishLike subhead  2014).merge(blackMountainView
  
  subhead)).copyWith, inherit: false, color: Color(0xdd000000), family:
  Roboto, size: 16.0, weight: 400, baseline: alphabetic, decoration:
  TextDecoration.none, softWrap:  wrapping at box width, overflow:
  clip):  Incorrect use of ParentDataWidget.
  
  Flexible widgets must be
  placed directly inside Flex widgets.  Flexible(no depth, flex: 1,
  dirty) has a Flex ancestor, but there are other widgets between them:
   - _ListTile
  
   - Padding(padding: EdgeInsets(16.0, 0.0, 16.0, 0.0))
   - Semantics(container: false, properties: SemanticsProperties, selected: false, label: null, value:  null, hint: null, hintOverrides:
  null)
  
   - Listener(listeners: [down], behavior: opaque)
   - _GestureSemantics
   - Listener(listeners: &lt;none behavior: translucent)
   - RepaintBoundary
   - IndexedSemantics(index: 0)
   - KeepAlive(keepAlive: false)
   - SliverList(delegate: SliverChildBuilderDelegate#6802e(estimated child count: 19))
  
   - SliverPadding(padding: EdgeInsets(0.0, 0.0, 0.0, 50.0))
   - Viewport(axisDirection: down, anchor: 0.0, offset: ScrollPositionWithSingleContext#c95ba(offset:
   0.0, range: null..null, viewport: 335.0, ScrollableState, AlwaysScrollableScrollPhysics - ClampingScrollPhysics,
  IdleScrollActivity#05a39, ScrollDirection.idle))
   - IgnorePointer-[GlobalKey#a3d1a](ignoring: false, ignoringSemantics: false)
  
   - Semantics(container: false, properties: SemanticsProperties, label: null, value: null, hint: null,  hintOverrides: null)
   - Listener(listeners: [down], behavior: opaque)
   - _GestureSemantics
  
   - Listener(listeners: [signal], behavior: deferToChild)
   - _ScrollSemantics-[GlobalKey#7cd1b]
   - RepaintBoundary
   - CustomPaint
   - RepaintBoundary
   - Expanded(flex: 1)  These widgets cannot come between a Flexible and its Flex.  The ownership chain for the parent of the offending
  Flexible was:    DefaultTextStyle ← AnimatedDefaultTextStyle ←
  _ListTile ← MediaQuery ← Padding ← SafeArea ←  Semantics ← Listener ← _GestureSemantics ← RawGestureDetector ← ⋯
  </code></pre>