Fix initial country filters (#771)

- iOS: skip filter to speed up selection of another country
- macOS: initial country filter was lost due to category/country
chaining

Passepartout/Library/Sources/AppUI/Views/Provider/VPNFiltersView.swift

@@ -52,15 +52,21 @@ struct VPNFiltersView: View {
 #endif
             }
         }
-        .onChange(of: model.filters.categoryName) { _ in
-            model.filters.countryCode = nil
-        }
     }
 }
 
 private extension VPNFiltersView {
+    var categoryNameBinding: Binding<String?> {
+        Binding {
+            model.filters.categoryName
+        } set: {
+            model.filters.categoryName = $0
+            model.filters.countryCode = nil
+        }
+    }
+
     var categoryPicker: some View {
-        Picker(Strings.Global.category, selection: $model.filters.categoryName) {
+        Picker(Strings.Global.category, selection: categoryNameBinding) {
             Text(Strings.Global.any)
                 .tag(nil as String?)
             ForEach(model.categories, id: \.self) {

Passepartout/Library/Sources/AppUI/Views/Provider/VPNProviderServerView.swift

@@ -81,7 +81,12 @@ extension VPNProviderServerView {
                 guard let selectedEntity, filtersWithSelection else {
                     return nil
                 }
-                return VPNFilters(with: selectedEntity.server.provider)
+                var filters = VPNFilters()
+                filters.categoryName = selectedEntity.server.provider.categoryName
+#if os(macOS)
+                filters.countryCode = selectedEntity.server.provider.countryCode
+#endif
+                return filters
             }(),
             selectTitle: selectTitle,
             onSelect: onSelect,