fix: webview in stack (#607)

Added check for if there is WebView on the screen we are transitioning to. If there is, we don't change the layer type in the stack navigator to avoid crash.

android/src/main/java/com/swmansion/rnscreens/Screen.java

@@ -8,6 +8,7 @@
 import android.view.ViewGroup;
 import android.view.WindowManager;
 import android.view.inputmethod.InputMethodManager;
+import android.webkit.WebView;
 import android.widget.TextView;
 
 import androidx.annotation.Nullable;
@@ -151,7 +152,25 @@ public void setTransitioning(boolean transitioning) {
       return;
     }
     mTransitioning = transitioning;
-    super.setLayerType(transitioning ? View.LAYER_TYPE_HARDWARE : View.LAYER_TYPE_NONE, null);
+    boolean isWebViewInScreen = hasWebView(this);
+    if (isWebViewInScreen && getLayerType() != View.LAYER_TYPE_HARDWARE) {
+      return;
+    }
+    super.setLayerType(transitioning && !isWebViewInScreen ? View.LAYER_TYPE_HARDWARE : View.LAYER_TYPE_NONE, null);
+  }
+
+  private boolean hasWebView(ViewGroup viewGroup) {
+    for(int i = 0; i < viewGroup.getChildCount(); i++) {
+      View child = viewGroup.getChildAt(i);
+      if (child instanceof WebView) {
+        return true;
+      } else if (child instanceof ViewGroup) {
+         if (hasWebView((ViewGroup) child)) {
+           return true;
+         }
+      }
+    }
+    return false;
   }
 
   public void setStackPresentation(StackPresentation stackPresentation) {