Fix issue where value providers could be ignored when falling back to…

… main thread rendering engine (airbnb#2164)

Example/Example/AnimationPreviewView.swift

@@ -60,6 +60,11 @@ struct AnimationPreviewView: View {
           animationPlaying = false
         }
       }
+      .configure { animationView in
+        DispatchQueue.main.async {
+          currentRenderingEngine = animationView.currentRenderingEngine
+        }
+      }
       .getRealtimeAnimationProgress(animationPlaying ? $sliderValue : nil)
 
       Spacer()
@@ -94,6 +99,7 @@ struct AnimationPreviewView: View {
       updateIndex()
     }
     .toolbar {
+      Text((currentRenderingEngine ?? .coreAnimation).description)
       optionsMenu
     }
   }
@@ -111,6 +117,7 @@ struct AnimationPreviewView: View {
   @State private var loopMode: LottieLoopMode = .loop
   @State private var playFromProgress: AnimationProgressTime = 0
   @State private var playToProgress: AnimationProgressTime = 1
+  @State private var currentRenderingEngine: RenderingEngine?
 
   private var playbackMode: LottiePlaybackMode {
     if animationPlaying {

Sources/Public/Animation/LottieAnimationLayer.swift

@@ -1097,6 +1097,10 @@ public class LottieAnimationLayer: CALayer {
 
     animationLayer.lottieAnimationLayer = self
 
+    for (keypath, valueProvider) in valueProviders {
+      animationLayer.setValueProvider(valueProvider, keypath: keypath)
+    }
+
     animationLayerDidLoad?(self, renderingEngine)
 
     animationLayer.renderScale = screenScale

Tests/SnapshotConfiguration.swift

@@ -111,7 +111,15 @@ extension SnapshotConfiguration {
     // Test cases for `RenderingEngineOption.automatic`
     "9squares_AlBoardman": .useAutomaticRenderingEngine, // Supports the Core Animation engine
     "LottieFiles/shop": .useAutomaticRenderingEngine, // Throws a compatibility error in `init`
-    "TypeFace/G": .useAutomaticRenderingEngine, // Throws a compatibility error in `display()`
+    "TypeFace/G": { // Throws a compatibility error in `display()`
+      var configuration = SnapshotConfiguration.useAutomaticRenderingEngine
+      configuration.customValueProviders = [
+        "G 2.Ellipse 1.Stroke 1.Color": ColorValueProvider(.red),
+        "G Outlines 3.G.Fill 1.Color": ColorValueProvider(.red),
+        "Shape Layer 18.Shape 1.Stroke 2.Color": ColorValueProvider(.red),
+      ]
+      return configuration
+    }(),
   ]
 }