[client] Clear selection on escape

client/lib/app_shortcuts.dart

@@ -7,6 +7,7 @@ enum SelectionMode {
   range,
   multi,
   toggle,
+  none,
 }
 
 class FocusUpIntent extends Intent {

client/lib/ui/explorer/explorer_actions.dart

@@ -38,7 +38,7 @@ class ExplorerActions extends StatelessWidget {
           return null;
         }),
         DismissIntent: CallbackAction<DismissIntent>(onInvoke: (i) {
-          context.read<ExplorerViewController>().updateSelection((i) => i, SelectionMode.single, true);
+          context.read<ExplorerViewController>().updateSelection((i) => i, SelectionMode.none, true);
           return null;
         }),
         ActivateIntent: CallbackAction<ActivateIntent>(onInvoke: (i) {

client/lib/ui/explorer/explorer_view_controller.dart

@@ -21,6 +21,7 @@ class ExplorerViewState {
   String? get focusId => focussed?.id;
   Iterable<Resource> get selected => resources.where((r) => selectedIds.contains(r.id));
   Resource? get selectedSingle => selectedIds.length != 1 ? null : resources.where((r) => selectedIds.contains(r.id)).firstOrNull;
+  Resource? get focussedIfSelected => selectedIds.isEmpty ? null : focussed;
 
   const ExplorerViewState({
     this.folder,
@@ -127,6 +128,10 @@ class ExplorerViewController extends StateNotifier<ExplorerViewState> {
         }
         selectionStartIndex = index;
         break;
+      case SelectionMode.none:
+        selectedIds = const {};
+        selectionStartIndex = index;
+        break;
       case SelectionMode.multi:
         break;
     }

client/lib/ui/explorer/resource_info_view.dart

@@ -15,7 +15,7 @@ class ResourceInfoView extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final resource = context.select<ExplorerViewState, Resource?>((state) {
-      return state.focussed ?? state.folder;
+      return state.focussedIfSelected ?? state.folder;
     });
 
     if (resource == null) {