For #6313 - On first load, hides engineView until firstContentfulPaint

app/src/androidTest/java/org/mozilla/fenix/ui/robots/BrowserRobot.kt

@@ -40,12 +40,6 @@ import org.mozilla.fenix.helpers.click
 import org.mozilla.fenix.helpers.ext.waitNotNull
 
 class BrowserRobot {
-
-    fun verifyBrowserScreen() {
-        onView(ViewMatchers.withResourceName("browserLayout"))
-            .check(matches(withEffectiveVisibility(ViewMatchers.Visibility.VISIBLE)))
-    }
-
     fun verifyCurrentPrivateSession(context: Context) {
         val session = context.components.core.sessionManager.selectedSession
         assertTrue("Current session is private", session?.private!!)
@@ -79,6 +73,7 @@ class BrowserRobot {
     */
     fun verifyPageContent(expectedText: String) {
         val mDevice = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation())
+        mDevice.waitNotNull(Until.findObject(By.res("org.mozilla.fenix.debug:id/engineView")), waitingTime)
         mDevice.waitNotNull(Until.findObject(text(expectedText)), waitingTime)
     }
 

app/src/main/java/org/mozilla/fenix/browser/BaseBrowserFragment.kt

@@ -179,7 +179,8 @@ abstract class BaseBrowserFragment : Fragment(), UserInteractionHandler, Session
             engineView = WeakReference(engineView),
             swipeRefresh = WeakReference(swipeRefresh),
             viewLifecycleScope = viewLifecycleOwner.lifecycleScope,
-            arguments = requireArguments()
+            arguments = requireArguments(),
+            firstContentfulHappened = ::didFirstContentfulHappen
         ).apply {
             beginAnimateInIfNecessary()
         }
@@ -862,6 +863,15 @@ abstract class BaseBrowserFragment : Fragment(), UserInteractionHandler, Session
         }
     }
 
+    private fun didFirstContentfulHappen(): Boolean {
+        val store = context?.components?.core?.store
+        val tabState = store?.state?.tabs?.find {
+            it.id == (customTabSessionId
+                ?: context?.components?.core?.sessionManager?.selectedSession?.id)
+        }
+        return tabState?.content?.firstContentfulPaint == true
+    }
+
     /*
      * Dereference these views when the fragment view is destroyed to prevent memory leaks
      */

app/src/main/java/org/mozilla/fenix/browser/BrowserAnimator.kt

@@ -33,7 +33,8 @@ class BrowserAnimator(
     private val engineView: WeakReference<EngineView>,
     private val swipeRefresh: WeakReference<View>,
     private val viewLifecycleScope: LifecycleCoroutineScope,
-    private val arguments: Bundle
+    private val arguments: Bundle,
+    private val firstContentfulHappened: () -> Boolean
 ) {
 
     private val unwrappedEngineView: EngineView?
@@ -52,22 +53,9 @@ class BrowserAnimator(
         }
 
         doOnEnd {
-            unwrappedEngineView?.asView()?.visibility = View.VISIBLE
+            if (firstContentfulHappened()) {
-            unwrappedSwipeRefresh?.background = null
+                unwrappedEngineView?.asView()?.visibility = View.VISIBLE
-            arguments.putBoolean(SHOULD_ANIMATE_FLAG, false)
+            }
-        }
-
-        interpolator = DecelerateInterpolator()
-        duration = ANIMATION_DURATION
-    }
-
-    private val browserFadeInValueAnimator = ValueAnimator.ofFloat(0f, END_ANIMATOR_VALUE).apply {
-        addUpdateListener {
-            unwrappedSwipeRefresh?.alpha = it.animatedFraction
-        }
-
-        doOnEnd {
-            unwrappedEngineView?.asView()?.visibility = View.VISIBLE
             unwrappedSwipeRefresh?.background = null
             arguments.putBoolean(SHOULD_ANIMATE_FLAG, false)
         }
@@ -92,7 +80,9 @@ class BrowserAnimator(
             }
         } else {
             unwrappedSwipeRefresh?.alpha = 1f
-            unwrappedEngineView?.asView()?.visibility = View.VISIBLE
+            if (firstContentfulHappened()) {
+                unwrappedEngineView?.asView()?.visibility = View.VISIBLE
+            }
             unwrappedSwipeRefresh?.background = null
         }
     }