android: back button cancels share (still pops)

lib/pages/chat_list.dart

@@ -42,6 +42,12 @@ class ChatListController extends State<ChatList> {
 
   String get activeChat => VRouter.of(context).pathParameters['roomid'];
 
+  SelectMode get selectMode => Matrix.of(context).shareContent != null
+      ? SelectMode.share
+      : selectedRoomIds.isEmpty
+          ? SelectMode.normal
+          : SelectMode.select;
+
   void _processIncomingSharedFiles(List<SharedMediaFile> files) {
     if (files?.isEmpty ?? true) return;
     VRouter.of(context).push('/rooms');
@@ -234,11 +240,6 @@ class ChatListController extends State<ChatList> {
   }
 
   void cancelAction() {
-    final selectMode = Matrix.of(context).shareContent != null
-        ? SelectMode.share
-        : selectedRoomIds.isEmpty
-            ? SelectMode.normal
-            : SelectMode.select;
     if (selectMode == SelectMode.share) {
       setState(() => Matrix.of(context).shareContent = null);
     } else {

lib/pages/views/chat_list_view.dart

@@ -20,17 +20,12 @@ class ChatListView extends StatelessWidget {
     return StreamBuilder<Object>(
         stream: Matrix.of(context).onShareContentChanged.stream,
         builder: (_, __) {
-          final selectMode = Matrix.of(context).shareContent != null
+          final selectMode = controller.selectMode;
-              ? SelectMode.share
-              : controller.selectedRoomIds.isEmpty
-                  ? SelectMode.normal
-                  : SelectMode.select;
           return VWidgetGuard(
               onSystemPop: (redirector) async {
-                if (controller.selectedRoomIds.isNotEmpty) {
+                final selMode = controller.selectMode;
-                  controller.cancelAction();
+                if (selMode != SelectMode.normal) controller.cancelAction();
-                  redirector.stopRedirection();
+                if (selMode == SelectMode.select) redirector.stopRedirection();
-                }
               },
               child: Scaffold(
                 appBar: AppBar(