Remove lock of ASTextNodeRendererKey (#1454)

* Remove lock of ASTextNodeRendererKey

* Remove class check for isEqual

* Add const specifier to function parameter

* Fixes typo

* Fixes typo

Source/ASDisplayNode.mm

@@ -118,7 +118,7 @@ id StubLayerActionImplementation(id receiver, SEL _cmd, NSString *key) { return
  *  @remarks        The instance value is used only if we suspect the class may be dynamic (because it overloads 
  *                  +respondsToSelector: or -respondsToSelector.) In that case we use our "slow path", calling this 
  *                  method on each -init and passing the instance value. While this may seem like an unlikely scenario,
- *                  it turns our our own internal tests use a dynamic class, so it's worth capturing this edge case.
+ *                  it turns out our own internal tests use a dynamic class, so it's worth capturing this edge case.
  *
  *  @return ASDisplayNode flags.
  */

Source/ASTextNode.mm

@@ -57,17 +57,25 @@ static NSString *ASTextNodeTruncationTokenAttributeName = @"ASTextNodeTruncation
 #pragma mark - ASTextKitRenderer
 
 @interface ASTextNodeRendererKey : NSObject
-@property (nonatomic) ASTextKitAttributes attributes;
-@property (nonatomic) CGSize constrainedSize;
+- (instancetype)initWithTextKitAttributes:(const ASTextKitAttributes &)attributes constrainedSize:(const CGSize)constrainedSize;
 @end
 
 @implementation ASTextNodeRendererKey {
-  std::mutex _m;
+  ASTextKitAttributes _attributes;
+  CGSize _constrainedSize;
+}
+
+- (instancetype)initWithTextKitAttributes:(const ASTextKitAttributes &)attributes constrainedSize:(const CGSize)constrainedSize
+{
+  if (self = [super init]) {
+    _attributes = attributes;
+    _constrainedSize = constrainedSize;
+  }
+  return self;
 }
 
 - (NSUInteger)hash
 {
-  std::lock_guard<std::mutex> _l(_m);
 #pragma clang diagnostic push
 #pragma clang diagnostic warning "-Wpadded"
   struct {
@@ -86,13 +94,10 @@ static NSString *ASTextNodeTruncationTokenAttributeName = @"ASTextNodeTruncation
   if (self == object) {
     return YES;
   }
-  
+  if (!object) {
+    return NO;
+  }
   // NOTE: Skip the class check for this specialized, internal Key object.
-
-  // Lock both objects, avoiding deadlock.
-  std::lock(_m, object->_m);
-  std::lock_guard<std::mutex> lk1(_m, std::adopt_lock);
-  std::lock_guard<std::mutex> lk2(object->_m, std::adopt_lock);
   
   return _attributes == object->_attributes && CGSizeEqualToSize(_constrainedSize, object->_constrainedSize);
 }
@@ -120,9 +125,7 @@ static ASTextKitRenderer *rendererForAttributes(ASTextKitAttributes attributes,
 {
   NSCache *cache = sharedRendererCache();
   
-  ASTextNodeRendererKey *key = [[ASTextNodeRendererKey alloc] init];
-  key.attributes = attributes;
-  key.constrainedSize = constrainedSize;
+  ASTextNodeRendererKey *key = [[ASTextNodeRendererKey alloc] initWithTextKitAttributes:attributes constrainedSize:constrainedSize];
 
   ASTextKitRenderer *renderer = [cache objectForKey:key];
   if (renderer == nil) {

Source/ASVisibilityProtocols.h

@@ -38,7 +38,7 @@ AS_EXTERN ASLayoutRangeMode ASLayoutRangeModeForVisibilityDepth(NSUInteger visib
  * @discussion Represents the number of user actions necessary to reach the view controller. An increased visibility
  * depth indicates a higher number of user interactions for the view controller to be visible again. For example,
  * an onscreen navigation controller's top view controller should have a visibility depth of 0. The view controller
- * one from the top should have a visibility deptch of 1 as should the root view controller in the stack (because
+ * one from the top should have a visibility depth of 1 as should the root view controller in the stack (because
  * the user can hold the back button to pop to the root view controller).
  *
  * Visibility depth is used to automatically adjust ranges on range controllers (and thus free up memory) and can