Add state logging when we reject an item animation from occurring.

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationFragment.java

@@ -791,8 +791,10 @@ public class ConversationFragment extends LoggingFragment implements Multiselect
 
   public void scrollToBottom() {
     if (getListLayoutManager().findFirstVisibleItemPosition() < SCROLL_ANIMATION_THRESHOLD) {
+      Log.d(TAG, "scrollToBottom: Smooth scrolling to bottom of screen.");
       list.smoothScrollToPosition(0);
     } else {
+      Log.d(TAG, "scrollToBottom: Scrolling to bottom of screen.");
       list.scrollToPosition(0);
     }
   }

app/src/main/java/org/thoughtcrime/securesms/conversation/mutiselect/ConversationItemAnimator.kt

@@ -5,6 +5,7 @@ import android.animation.AnimatorSet
 import android.animation.ValueAnimator
 import androidx.core.animation.doOnEnd
 import androidx.recyclerview.widget.RecyclerView
+import org.signal.core.util.logging.Log
 import org.thoughtcrime.securesms.conversation.ConversationAdapter
 
 /**
@@ -19,11 +20,6 @@ class ConversationItemAnimator(
   private val isParentFilled: () -> Boolean
 ) : RecyclerView.ItemAnimator() {
 
-  private enum class Operation {
-    ADD,
-    CHANGE
-  }
-
   private data class TweeningInfo(
     val startValue: Float,
     val endValue: Float
@@ -63,11 +59,12 @@ class ConversationItemAnimator(
       return false
     }
 
-    return animateSlide(viewHolder, preLayoutInfo, postLayoutInfo, Operation.ADD)
+    return animateSlide(viewHolder, preLayoutInfo, postLayoutInfo)
   }
 
-  private fun animateSlide(viewHolder: RecyclerView.ViewHolder, preLayoutInfo: ItemHolderInfo?, postLayoutInfo: ItemHolderInfo, operation: Operation): Boolean {
+  private fun animateSlide(viewHolder: RecyclerView.ViewHolder, preLayoutInfo: ItemHolderInfo?, postLayoutInfo: ItemHolderInfo): Boolean {
     if (isInMultiSelectMode() || !shouldPlayMessageAnimations()) {
+      Log.d(TAG, "Dropping slide animation: (${isInMultiSelectMode()}, ${shouldPlayMessageAnimations()}) :: ${viewHolder.absoluteAdapterPosition}")
       dispatchAnimationFinished(viewHolder)
       return false
     }
@@ -84,6 +81,7 @@ class ConversationItemAnimator(
     }.toFloat()
 
     if (translationY == 0f) {
+      viewHolder.itemView.translationY = 0f
       dispatchAnimationFinished(viewHolder)
       return false
     }
@@ -101,9 +99,10 @@ class ConversationItemAnimator(
         dispatchAnimationFinished(viewHolder)
         false
       } else {
-        animateSlide(viewHolder, preLayoutInfo, postLayoutInfo, Operation.CHANGE)
+        animateSlide(viewHolder, preLayoutInfo, postLayoutInfo)
       }
     } else {
+      Log.d(TAG, "Dropping persistence animation: (${isInMultiSelectMode()}, ${shouldPlayMessageAnimations()}, ${isParentFilled()}) :: ${viewHolder.absoluteAdapterPosition}")
       dispatchAnimationFinished(viewHolder)
       false
     }
@@ -118,6 +117,7 @@ class ConversationItemAnimator(
   }
 
   override fun runPendingAnimations() {
+    Log.d(TAG, "Starting ${pendingSlideAnimations.size} animations.")
     runPendingSlideAnimations()
   }
 
@@ -178,7 +178,7 @@ class ConversationItemAnimator(
     slideAnimations[item]?.sharedAnimator?.cancel()
   }
 
-  fun endSlideAnimations() {
+  private fun endSlideAnimations() {
     slideAnimations.values.map { it.sharedAnimator }.forEach {
       it.cancel()
     }
@@ -186,7 +186,12 @@ class ConversationItemAnimator(
 
   private fun dispatchFinishedWhenDone() {
     if (!isRunning) {
+      Log.d(TAG, "Finished running animations.")
       dispatchAnimationsFinished()
     }
   }
+
+  companion object {
+    private val TAG = Log.tag(ConversationItemAnimator::class.java)
+  }
 }