Don't copy container during ASTextNode2 layout (#1115)

CHANGELOG.md

@@ -39,6 +39,7 @@
 - Renamed `accessibleElements` to `accessibilityElements` and removed the re-definition of the property in ASDisplayView. [Jia Wern Lim](https://github.com/jiawernlim)
 - Remove double scaling of lineHeightMultiple & paragraphSpacing attributes in ASTextKitFontSizeAdjuster. [Eric Jensen](https://github.com/ejensen)
 - Add a delegate callback for when the framework has initialized. [Adlai Holler](https://github.com/Adlai-Holler)
+- Improve TextNode2 by skipping an unneeded copy during measurement. [Adlai Holler](https://github.com/Adlai-Holler)
 
 ## 2.7
 - Fix pager node for interface coalescing. [Max Wang](https://github.com/wsdwsd0829) [#877](https://github.com/TextureGroup/Texture/pull/877)

Source/ASTextNode2.mm

@@ -232,19 +232,12 @@ static NSArray *DefaultLinkAttributeNames = @[ NSLinkAttributeName ];
 
   ASLockScopeSelf();
 
-  ASTextContainer *container;
-  if (!CGSizeEqualToSize(container.size, constrainedSize)) {
-    container = [_textContainer copy];
-    container.size = constrainedSize;
-    [container makeImmutable];
-  } else {
-    container = _textContainer;
-  }
+  _textContainer.size = constrainedSize;
   [self _ensureTruncationText];
   
   NSMutableAttributedString *mutableText = [_attributedText mutableCopy];
   [self prepareAttributedString:mutableText];
-  ASTextLayout *layout = [ASTextNode2 compatibleLayoutWithContainer:container text:mutableText];
+  ASTextLayout *layout = [ASTextNode2 compatibleLayoutWithContainer:_textContainer text:mutableText];
   
   return layout.textBoundingSize;
 }