Handle pages with multiple debouncers

lib/redux/app/app_middleware.dart

@@ -378,7 +378,7 @@ Middleware<AppState> _createPersistData(
   };
 }
 
-final _persistUIDebouncer = PersistUIDebouncer();
+final _persistUIDebouncer = SimpleDebouncer();
 Middleware<AppState> _createPersistUI(PersistenceRepository uiRepository) {
   return (Store<AppState> store, dynamic dynamicAction, NextDispatcher next) {
     final action = dynamicAction as PersistUI;

lib/ui/design/edit/design_edit.dart

@@ -51,9 +51,10 @@ class _DesignEditState extends State<DesignEdit>
   static final GlobalKey<FormState> _formKey =
       GlobalKey<FormState>(debugLabel: '_designEdit');
 
-  final _pdfDebouncer = Debouncer(milliseconds: kMillisecondsToDebounceSave);
   final _debouncer = Debouncer();
-  final _htmlDebouncer = Debouncer();
+  final _pdfDebouncer =
+      SimpleDebouncer(milliseconds: kMillisecondsToDebounceSave);
+  final _htmlDebouncer = SimpleDebouncer();
 
   final _nameController = TextEditingController();
   final _htmlController = TextEditingController();

lib/ui/invoice/edit/invoice_edit_desktop.dart

@@ -1124,7 +1124,8 @@ class _PdfPreview extends StatefulWidget {
 }
 
 class __PdfPreviewState extends State<_PdfPreview> {
-  final _pdfDebouncer = Debouncer(milliseconds: kMillisecondsToDebounceSave);
+  final _pdfDebouncer =
+      SimpleDebouncer(milliseconds: kMillisecondsToDebounceSave);
 
   int _pageCount = 1;
   int _currentPage = 1;

lib/ui/settings/client_portal.dart

@@ -57,7 +57,7 @@ class _ClientPortalState extends State<ClientPortal>
   bool _isCheckingSubdomain = false;
 
   final _subdomainDebouncer =
-      Debouncer(milliseconds: kMillisecondsToDebounceSave);
+      SimpleDebouncer(milliseconds: kMillisecondsToDebounceSave);
   final _debouncer = Debouncer();
 
   final _subdomainController = TextEditingController();

lib/utils/completers.dart

@@ -118,8 +118,12 @@ class Debouncer {
   }
 }
 
-class PersistUIDebouncer {
-  PersistUIDebouncer();
+class SimpleDebouncer {
+  SimpleDebouncer({
+    this.milliseconds = kMillisecondsToDebounceWrite,
+  });
+
+  final int milliseconds;
 
   static VoidCallback action;
   static Timer timer;
@@ -132,7 +136,7 @@ class PersistUIDebouncer {
       Debouncer.action = action;
     }
 
-    timer = Timer(Duration(milliseconds: kMillisecondsToDebounceWrite), () {
+    timer = Timer(Duration(milliseconds: milliseconds), () {
       if (action != null) {
         action();
       }