Trigger transition only when requested from content wrapper layout

Author: kkafar

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

@@ -85,6 +85,13 @@ class Screen(
     var sheetClosesOnTouchOutside = true
     var sheetElevation: Float = 24F
 
+    /**
+     * When using form sheet presentation we want to delay enter transition **on Paper** in order
+     * to wait for initial layout from React, otherwise the animator-based animation will look
+     * glitchy. *This is not needed on Fabric*.
+     */
+    var shouldTriggerPostponedTransitionAfterLayout = false
+
     var footer: ScreenFooter? = null
         set(value) {
             if (value == null && field != null) {
@@ -135,6 +142,7 @@ class Screen(
 
             if (!BuildConfig.IS_NEW_ARCHITECTURE_ENABLED) {
                 // On old architecture we delay enter transition in order to wait for initial frame.
+                shouldTriggerPostponedTransitionAfterLayout = true
                 val parent = parentAsViewGroup()
                 if (parent != null && !parent.isInLayout) {
                     // There are reported cases (irreproducible) when Screen is not laid out after
@@ -200,8 +208,11 @@ class Screen(
 
     private fun triggerPostponedEnterTransitionIfNeeded() {
         Log.i("RNScreens", "startPostponedEnterTransition")
-        // This will trigger enter transition only if one was requested by ScreenStack
-        fragment?.startPostponedEnterTransition()
+        if (shouldTriggerPostponedTransitionAfterLayout) {
+            shouldTriggerPostponedTransitionAfterLayout = false
+            // This will trigger enter transition only if one was requested by ScreenStack
+            fragment?.startPostponedEnterTransition()
+        }
     }
 
     private fun updateScreenSizePaper(