fix(ios): invalidate G / foreignObject on change in native children

ios/Elements/RNSVGForeignObject.h

@@ -5,7 +5,6 @@
 
 @interface RNSVGForeignObject : RNSVGGroup
 
-- (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher;
 @property (nonatomic, strong) RNSVGLength *x;
 @property (nonatomic, strong) RNSVGLength *y;
 @property (nonatomic, strong) RNSVGLength *foreignObjectwidth;

ios/Elements/RNSVGForeignObject.m

@@ -7,53 +7,19 @@
  */
 #import "RNSVGForeignObject.h"
 #import "RNSVGNode.h"
-#import "RCTUIManager.h"
-#import "RCTUIManagerObserverCoordinator.h"
 
 @implementation RNSVGForeignObject
-{
-    RCTEventDispatcher *_eventDispatcher;
-    bool _ready;
-}
 
 - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
 {
     return nil;
 }
 
-- (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
-{
-  RCTAssertParam(eventDispatcher);
-
-    if ((self = [super init])) {
-        _eventDispatcher = eventDispatcher;
-        [_eventDispatcher.bridge.uiManager.observerCoordinator addObserver:self];
-    }
-    return self;
-}
-
 - (void)parseReference
 {
     self.dirty = false;
 }
 
-- (void)uiManagerDidPerformMounting:(RCTUIManager *)manager
-{
-  [manager addUIBlock:^(__unused RCTUIManager *uiManager, __unused NSDictionary<NSNumber *, UIView *> *viewRegistry) {
-      if (!self->_ready) {
-          [self invalidate];
-      }
-  }];
-}
-
-- (void)renderChildTo:(CGContextRef)context rect:(CGRect)rect node:(UIView*)node
-{
-    node.hidden = false;
-    self->_ready = [node drawViewHierarchyInRect:rect afterScreenUpdates:true];
-    [node.layer renderInContext:context];
-    node.hidden = true;
-}
-
 - (void)renderLayerTo:(CGContextRef)context rect:(CGRect)rect
 {
     [self clip:context];

ios/Elements/RNSVGGroup.m

@@ -72,7 +72,9 @@
             CGContextClipToRect(context, rect);
             [svgView drawToContext:context withRect:rect];
         } else {
-            [self renderChildTo:context rect:rect node:node];
+            node.hidden = false;
+            [node.layer renderInContext:context];
+            node.hidden = true;
         }
 
         return YES;
@@ -105,11 +107,9 @@
     [self popGlyphContext];
 }
 
-- (void)renderChildTo:(CGContextRef)context rect:(CGRect)rect node:(UIView*)node
+- (void)drawRect:(CGRect)rect
 {
-    node.hidden = false;
-    [node.layer renderInContext:context];
-    node.hidden = true;
+    [self invalidate];
 }
 
 - (void)setupGlyphContext:(CGContextRef)context

ios/ViewManagers/RNSVGForeignObjectManager.m

@@ -15,7 +15,7 @@ RCT_EXPORT_MODULE()
 
 - (RNSVGForeignObject *)node
 {
-    return [[RNSVGForeignObject alloc] initWithEventDispatcher:self.bridge.eventDispatcher];
+    return [RNSVGForeignObject new];
 }
 
 RCT_EXPORT_VIEW_PROPERTY(x, RNSVGLength*)