Fix layer backed nodes not update properly

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## master
 * Add your own contributions to the next release on the line below this with your name.
+- [ASDisplayNode] Do not cancel display when in exit hierarchy but let interface state changing to handle it. [Max Wang](https://github.com/wsdwsd0829). [#1110](https://github.com/TextureGroup/Texture/pull/1110)
 - [Breaking][ASDisplayNode] Make interface state delegate protocol required. [Max Wang](https://github.com/wsdwsd0829). [#1112](https://github.com/TextureGroup/Texture/pull/1112)
 - [ASCollectionView] Fix reording of cells manually for iOS 9 & 10. [Max Wang](https://github.com/wsdwsd0829). [#1081](https://github.com/TextureGroup/Texture/pull/1081)
 - [ASDisplayNode] Allow add/remove interface state delegates on background thread. [Max Wang](https://github.com/wsdwsd0829). [#1090](https://github.com/TextureGroup/Texture/pull/1090)

Source/ASDisplayNode.mm

@@ -2846,9 +2846,7 @@ - (void)__exitHierarchy
     _flags.isExitingHierarchy = YES;
     _flags.isInHierarchy = NO;
 
-    [self._locked_asyncLayer cancelAsyncDisplay];
-
-    // Don't call -didExitHierarchy while holding __instanceLock__.
+    // Don't call -didExitHierarchy while holding __instanceLock__. 
     // This method and subsequent ones (i.e -interfaceState and didExit(.*)State)
     // don't expect that they are called while the lock is being held.
     // More importantly, didExit(.*)State methods are meant to be overriden by clients.