Fixed missing compose/answer button

app/src/main/java/eu/faircode/email/AdapterMessage.java

@@ -950,6 +950,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     }
                 });
 
+            itemView.addOnLayoutChangeListener(this);
             ibAvatar.setOnClickListener(this);
             ibVerified.setOnClickListener(this);
             ibAuth.setOnClickListener(this);
@@ -1063,6 +1064,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             final View touch = (viewType == ViewType.THREAD ? ibExpander : header);
             touch.setOnClickListener(null);
 
+            itemView.removeOnLayoutChangeListener(this);
             ibAvatar.setOnClickListener(null);
             ibVerified.setOnClickListener(null);
             ibAuth.setOnClickListener(null);
@@ -3782,6 +3784,11 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
 
         @Override
         public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
+            if (itemView.getId() == v.getId()) {
+                properties.layoutChanged();
+                return;
+            }
+
             TupleMessageEx message = getMessage();
             if (message != null) {
                 int h = bottom - top;
@@ -7971,6 +7978,8 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
 
         void lock(long id);
 
+        void layoutChanged();
+
         void refresh();
 
         void finish();

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -753,6 +753,16 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                     Log.w(ex);
                 }
             }
+
+            @Override
+            public void onItemsAdded(@NonNull RecyclerView recyclerView, int positionStart, int itemCount) {
+                iProperties.layoutChanged();
+            }
+
+            @Override
+            public void onItemsRemoved(@NonNull RecyclerView recyclerView, int positionStart, int itemCount) {
+                iProperties.layoutChanged();
+            }
         };
         rvMessage.setLayoutManager(llm);
 
@@ -1005,16 +1015,10 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
             @Override
             public void onScrolled(@NonNull RecyclerView rv, int dx, int dy) {
                 if (dy != 0) {
-                    boolean down = (dy > 0 && rv.canScrollVertically(RecyclerView.FOCUS_DOWN));
+                    boolean down = (dy > 0 && rv.canScrollVertically(1));
                     if (scrolling != down) {
                         scrolling = down;
-                        if (!accessibility &&
-                                (viewType == AdapterMessage.ViewType.UNIFIED ||
-                                        viewType == AdapterMessage.ViewType.FOLDER))
-                            if (down)
-                                fabCompose.hide();
-                            else
-                                fabCompose.show();
+                        updateCompose();
                         updateExpanded();
                     }
                 }
@@ -2126,11 +2130,6 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                     }
                 });
             }
-
-            if ("headers".equals(name)) {
-                scrolling = false;
-                updateExpanded();
-            }
         }
 
         @Override
@@ -2210,9 +2209,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                     }
             }
 
-            if (value)
-                scrolling = false;
-
+            scrolling = false;
             updateExpanded();
             if (value)
                 handleExpand(message.id);
@@ -2412,6 +2409,24 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
             }.execute(FragmentMessages.this, args, "message:lock");
         }
 
+        @Override
+        public void layoutChanged() {
+            rvMessage.post(new Runnable() {
+                @Override
+                public void run() {
+                    try {
+                        if (scrolling && !rvMessage.canScrollVertically(-1)) {
+                            scrolling = false;
+                            updateCompose();
+                            updateExpanded();
+                        }
+                    } catch (Throwable ex) {
+                        Log.e(ex);
+                    }
+                }
+            });
+        }
+
         @Override
         public void refresh() {
             rvMessage.post(new Runnable() {
@@ -4437,7 +4452,6 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                                 positions.remove(id);
                                 attachments.remove(id);
                             }
-                            updateExpanded();
                         }
                     }
                 });
@@ -6570,6 +6584,16 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
         return false;
     }
 
+    private void updateCompose() {
+        if (!accessibility &&
+                (viewType == AdapterMessage.ViewType.UNIFIED ||
+                        viewType == AdapterMessage.ViewType.FOLDER))
+            if (scrolling)
+                fabCompose.hide();
+            else
+                fabCompose.show();
+    }
+
     private void updateExpanded() {
         if (!getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED))
             return;