Fixes #945 - Reselect strands after assigning properties

Author: Sanjana Mali

lib/src/middleware/all_middleware.dart

@@ -1,4 +1,5 @@
 import 'package:redux/redux.dart';
+import 'package:scadnano/src/middleware/reselect_after_props.dart';
 import 'package:scadnano/src/middleware/system_clipboard.dart';
 
 import '../state/app_state.dart';
@@ -68,6 +69,7 @@ final all_middleware = List<Middleware<AppState>>.unmodifiable([
   reselect_moved_dna_extension_ends_middleware,
   reselect_moved_copied_strands_middleware,
   reselect_moved_domains_middleware,
+  reselect_after_props,
   selections_intersect_box_compute_middleware,
   insertion_deletion_batching_middleware,
   adjust_grid_position_middleware,

lib/src/middleware/reselect_after_props.dart

@@ -0,0 +1,52 @@
+import 'package:built_collection/built_collection.dart';
+import 'package:redux/redux.dart';
+import 'package:scadnano/src/actions/actions.dart' as actions;
+import 'package:scadnano/src/state/app_state.dart';
+import 'package:scadnano/src/state/design.dart';
+import 'package:scadnano/src/state/strand.dart';
+
+bool are_batch_actions(dynamic action) {
+  for (var action in action.actions) {
+    if (!(action is actions.StrandNameSet ||
+        action is actions.StrandOrSubstrandColorSet ||
+        action is actions.ScaffoldSet ||
+        action is actions.SubstrandNameSet ||
+        action is actions.StrandLabelSet ||
+        action is actions.SubstrandLabelSet ||
+        action is actions.RemoveDNA)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+reselect_after_props(Store<AppState> store, action, NextDispatcher next) {
+  List<String> prevIds = store.state.ui_state.selectables_store.selected_strands.map((s) => s.id).toList();
+  if (action is actions.BatchAction && are_batch_actions(action) ||
+      ((action is actions.AssignDNAComplementFromBoundStrands ||
+              action is actions.ScalePurificationVendorFieldsAssign ||
+              action is actions.AssignDomainNameComplementFromBoundDomains ||
+              action is actions.AssignDNA ||
+              action is actions.StrandOrSubstrandColorSet ||
+              action is actions.SubstrandNameSet ||
+              action is actions.SubstrandLabelSet ||
+              action is actions.ExtensionAdd ||
+              action is actions.PlateWellVendorFieldsAssign ||
+              action is actions.PlateWellVendorFieldsRemove ||
+              action is actions.VendorFieldsRemove ||
+              action is actions.StrandsReflect) &&
+          prevIds.length > 1)) {
+    next(action);
+
+    List<Strand> new_strands = [];
+    Design newDesign = store.state.design;
+    for (var strand in newDesign.strands) {
+      if (prevIds.contains(strand.id)) {
+        new_strands.add(strand);
+      }
+    }
+    store.dispatch(actions.SelectAll(selectables: new_strands.toBuiltList(), only: true));
+  } else {
+    next(action);
+  }
+}