Fix crash when opening reactions bottom sheet.

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

@@ -1582,16 +1582,16 @@ public class ConversationFragment extends LoggingFragment implements Multiselect
 
     @Override
     public void onReactionClicked(@NonNull MultiselectPart multiselectPart, long messageId, boolean isMms) {
-      if (getContext() == null) return;
+      if (getParentFragment() == null) return;
 
-      ReactionsBottomSheetDialogFragment.create(messageId, isMms).show(requireFragmentManager(), null);
+      ReactionsBottomSheetDialogFragment.create(messageId, isMms).show(getParentFragmentManager(), null);
     }
 
     @Override
     public void onGroupMemberClicked(@NonNull RecipientId recipientId, @NonNull GroupId groupId) {
-      if (getContext() == null) return;
+      if (getParentFragment() == null) return;
 
-      RecipientBottomSheetDialogFragment.create(recipientId, groupId).show(requireFragmentManager(), "BOTTOM");
+      RecipientBottomSheetDialogFragment.create(recipientId, groupId).show(getParentFragmentManager(), "BOTTOM");
     }
 
     @Override
@@ -1647,7 +1647,11 @@ public class ConversationFragment extends LoggingFragment implements Multiselect
 
     @Override
     public void onGroupMigrationLearnMoreClicked(@NonNull GroupMigrationMembershipChange membershipChange) {
-      GroupsV1MigrationInfoBottomSheetDialogFragment.show(requireFragmentManager(), membershipChange);
+      if (getParentFragment() == null) {
+        return;
+      }
+
+      GroupsV1MigrationInfoBottomSheetDialogFragment.show(getParentFragmentManager(), membershipChange);
     }
 
     @Override

app/src/main/java/org/thoughtcrime/securesms/reactions/ReactionsBottomSheetDialogFragment.java

@@ -57,7 +57,13 @@ public final class ReactionsBottomSheetDialogFragment extends BottomSheetDialogF
   public void onAttach(@NonNull Context context) {
     super.onAttach(context);
 
-    callback = (Callback) context;
+    if (context instanceof Callback) {
+      callback = (Callback) context;
+    } else if (getParentFragment() instanceof Callback) {
+      callback = (Callback) getParentFragment();
+    } else {
+      throw new IllegalStateException("Parent component does not implement Callback");
+    }
   }
 
   @Override