Moved key to surrounding provider.

Author: chrfalch

src/Transitioner.js

@@ -43,8 +43,7 @@ const defaultRenderScreen = (
 ) => (
   <Animated.View
     style={[{ ...StyleSheet.absoluteFillObject }, behindScreenStyles]}
-    pointerEvents={'auto'}
-    key={key}
+    pointerEvents={'auto'}    
   >
     <ScreenComponent
       transition={transition}
@@ -290,11 +289,11 @@ export class Transitioner extends React.Component {
           const renderFunc = descriptor.options.renderScreen || defaultRenderScreen;
 
           return (
-            <NavigationProvider value={descriptor.navigation}>              
+            <NavigationProvider key={key} value={descriptor.navigation}>              
               {renderFunc(C, transition, transitions, transitioningFromState,
                 transitionRouteKey ? navigation.state : null,
                 transitionRouteKey, descriptor.navigation, ref, 
-                behindScreenStyles)}
+                behindScreenStyles, key)}
             </NavigationProvider>            
           );
         }))}