[Unfold animation] Do not animate first progress value in remote provider

Updates unfold remote filter to start animating
values only after the first progress event has received.

Currently the default value is 1f and when
unfolding we might see launcher animating from progress
1f to the current progress and then back to 1f.

Bug: 271099882
Test: atest com.android.systemui.unfold.progress.UnfoldRemoteFilterTest
Test: manual testing fold/unfold with removed black overlay
Test: check that laucher progress perfetto trace doesn't have a jump
Change-Id: I4880d19034cdfd91faebf754939d7906c813a315

packages/SystemUI/tests/src/com/android/systemui/unfold/progress/UnfoldRemoteFilterTest.kt

@@ -39,15 +39,35 @@ class UnfoldRemoteFilterTest : SysuiTestCase() {
     }
 
     @Test
-    fun onTransitionProgress_withInterval_propagated() {
-        runOnMainThreadWithInterval(
-            { progressProvider.onTransitionStarted() },
-            { progressProvider.onTransitionProgress(0.5f) }
-        )
+    fun onTransitionProgress_firstProgressEvent_propagatedImmediately() {
+        progressProvider.onTransitionStarted()
+        progressProvider.onTransitionProgress(0.5f)
 
         listener.assertLastProgress(0.5f)
     }
 
+    @Test
+    fun onTransitionProgress_secondProgressEvent_isNotPropagatedImmediately() =
+        InstrumentationRegistry.getInstrumentation().runOnMainSync {
+            progressProvider.onTransitionStarted()
+            progressProvider.onTransitionProgress(0.5f)
+            progressProvider.onTransitionProgress(0.8f)
+
+            // 0.8f should be set only later, after the animation
+            listener.assertLastProgress(0.5f)
+        }
+
+    @Test
+    fun onTransitionProgress_severalProgressEventsWithInterval_propagated() {
+        runOnMainThreadWithInterval(
+            { progressProvider.onTransitionStarted() },
+            { progressProvider.onTransitionProgress(0.5f) },
+            { progressProvider.onTransitionProgress(0.8f) }
+        )
+
+        listener.assertLastProgress(0.8f)
+    }
+
     @Test
     fun onTransitionEnded_propagated() {
         runOnMainThreadWithInterval(

packages/SystemUI/unfold/src/com/android/systemui/unfold/progress/UnfoldRemoteFilter.kt

@@ -34,6 +34,7 @@ class UnfoldRemoteFilter(
         }
 
     private var inProgress = false
+    private var receivedProgressEvent = false
 
     private var processedProgress: Float = 1.0f
         set(newProgress) {
@@ -54,7 +55,16 @@ class UnfoldRemoteFilter(
     override fun onTransitionProgress(progress: Float) {
         logCounter({ "$TAG#plain_remote_progress" }, progress)
         if (inProgress) {
-            springAnimation.animateToFinalPosition(progress)
+            if (receivedProgressEvent) {
+                // We have received at least one progress event, animate from the previous
+                // progress to the current
+                springAnimation.animateToFinalPosition(progress)
+            } else {
+                // This is the first progress event after starting the animation, send it
+                // straightaway and set the spring value without animating it
+                processedProgress = progress
+                receivedProgressEvent = true
+            }
         } else {
             Log.e(TAG, "Progress received while not in progress.")
         }
@@ -62,6 +72,7 @@ class UnfoldRemoteFilter(
 
     override fun onTransitionFinished() {
         inProgress = false
+        receivedProgressEvent = false
         listener.onTransitionFinished()
     }