fix(ui): make ConversationInputSurface load state monotonic

SalmonEgg/SalmonEgg/Presentation/Views/Chat/ChatView.xaml

@@ -394,6 +394,7 @@
                 <!-- 输入区域 -->
                 <controls:ResponsiveContentHost Grid.Row="5"
                                                 MaxContentWidth="{x:Bind models:UiLayout.ContentMaxWidth, Mode=OneTime}"
+                                                x:Load="{x:Bind ViewModel.ShouldLoadConversationInputSurface, Mode=OneWay}"
                                                 Visibility="{x:Bind ViewModel.ShouldShowConversationInputSurface, Mode=OneWay, Converter={StaticResource BoolToVisibilityConverter}}">
                     <controls:ResponsiveContentHost.Child>
                         <controls:ChatInputArea x:Name="ConversationInputArea"

global.json

@@ -3,7 +3,7 @@
     "Uno.Sdk": "6.5.36"
   },
   "sdk": {
-    "version": "10.0.109",
+    "version": "10.0.103",
     "rollForward": "latestMinor",
     "allowPrerelease": false
   },

src/SalmonEgg.Presentation.Core/ViewModels/Chat/ChatViewModel.cs

@@ -614,6 +614,9 @@ public bool ShouldLoadTranscriptSurface
     public bool ShouldShowConversationInputSurface
         => ResolveConversationSurfaceProjection().ShouldShowConversationInputSurface;
 
+    public bool ShouldLoadConversationInputSurface
+        => ResolveConversationSurfaceProjection().ShouldLoadConversationInputSurface;
+
     public bool ShouldShowBlockingLoadingMask
         => ResolveConversationSurfaceProjection().ShouldShowBlockingLoadingMask;
 

src/SalmonEgg.Presentation.Core/ViewModels/Chat/Overlay/ChatConversationSurfaceProjection.cs

@@ -11,6 +11,7 @@ internal readonly record struct ChatConversationSurfaceProjection(
     bool ShouldShowTranscriptSurface,
     bool ShouldLoadTranscriptSurface,
     bool ShouldShowConversationInputSurface,
+    bool ShouldLoadConversationInputSurface,
     bool ShouldShowBlockingLoadingMask,
     bool ShouldShowLoadingOverlayStatusPill,
     bool ShouldShowLoadingOverlayPresenter,

src/SalmonEgg.Presentation.Core/ViewModels/Chat/Overlay/ChatConversationSurfaceProjectionCoordinator.cs

@@ -6,13 +6,15 @@ internal sealed class ChatConversationSurfaceProjectionCoordinator
 {
     private bool _hasLoadedActiveConversationRoot;
     private bool _hasLoadedTranscriptSurface;
+    private bool _hasLoadedConversationInputSurface;
 
     public ChatConversationSurfaceProjection Project(ChatConversationSurfaceStateInput input)
     {
         var state = ChatConversationSurfaceStatePresenter.Resolve(input);
 
         _hasLoadedActiveConversationRoot |= state.ShouldShowActiveConversationRoot;
         _hasLoadedTranscriptSurface |= state.ShouldShowTranscriptSurface;
+        _hasLoadedConversationInputSurface |= state.ShouldShowConversationInputSurface;
 
         return new ChatConversationSurfaceProjection(
             state.IsActivationOverlayVisible,
@@ -23,6 +25,7 @@ public ChatConversationSurfaceProjection Project(ChatConversationSurfaceStateInp
             state.ShouldShowTranscriptSurface,
             _hasLoadedTranscriptSurface,
             state.ShouldShowConversationInputSurface,
+            _hasLoadedConversationInputSurface,
             state.ShouldShowBlockingLoadingMask,
             state.ShouldShowLoadingOverlayStatusPill,
             state.ShouldShowLoadingOverlayPresenter,

tests/SalmonEgg.Presentation.Core.Tests/Chat/Overlay/ChatConversationSurfaceProjectionCoordinatorTests.cs

@@ -99,4 +99,51 @@ public void Project_WhenTranscriptSurfaceWasShown_KeepsLoadStateWhenLaterHidden(
         Assert.False(hidden.ShouldShowTranscriptSurface);
         Assert.True(hidden.ShouldLoadTranscriptSurface);
     }
+
+    [Fact]
+    public void Project_WhenConversationInputSurfaceWasShown_KeepsLoadStateWhenLaterHidden()
+    {
+        var coordinator = new ChatConversationSurfaceProjectionCoordinator();
+
+        var visible = coordinator.Project(new ChatConversationSurfaceStateInput(
+            IsSessionActive: true,
+            CurrentSessionId: "conv-1",
+            MessageHistoryCount: 0,
+            VisibleTranscriptConversationId: null,
+            IsChatShellVisibleForRemoteUi: true,
+            IsConnecting: false,
+            IsInitializing: false,
+            IsHydrating: false,
+            IsLayoutLoading: false,
+            IsSessionSwitching: false,
+            SessionSwitchOverlayConversationId: null,
+            SessionSwitchPreviewConversationId: null,
+            ConnectionLifecycleOverlayConversationId: null,
+            HistoryOverlayConversationId: null,
+            PendingShellActivationConversationId: null,
+            HydrationLoadedMessageCount: 0));
+
+        var hidden = coordinator.Project(new ChatConversationSurfaceStateInput(
+            IsSessionActive: true,
+            CurrentSessionId: "conv-1",
+            MessageHistoryCount: 0,
+            VisibleTranscriptConversationId: null,
+            IsChatShellVisibleForRemoteUi: true,
+            IsConnecting: false,
+            IsInitializing: false,
+            IsHydrating: false,
+            IsLayoutLoading: false,
+            IsSessionSwitching: true,
+            SessionSwitchOverlayConversationId: "conv-2",
+            SessionSwitchPreviewConversationId: null,
+            ConnectionLifecycleOverlayConversationId: null,
+            HistoryOverlayConversationId: null,
+            PendingShellActivationConversationId: null,
+            HydrationLoadedMessageCount: 0));
+
+        Assert.True(visible.ShouldShowConversationInputSurface);
+        Assert.True(visible.ShouldLoadConversationInputSurface);
+        Assert.False(hidden.ShouldShowConversationInputSurface);
+        Assert.True(hidden.ShouldLoadConversationInputSurface);
+    }
 }

tests/SalmonEgg.Presentation.Core.Tests/Ui/XamlComplianceTests.cs

@@ -1403,6 +1403,7 @@ public void ChatView_UsesDeferredTranscriptLoadingWithoutWholePageLifecycleHack(
         Assert.Contains("x:Name=\"ActiveConversationRoot\"", xaml);
         Assert.Contains("x:Load=\"{x:Bind ViewModel.ShouldLoadActiveConversationRoot, Mode=OneWay}\"", xaml);
         Assert.Contains("x:Load=\"{x:Bind ViewModel.ShouldLoadTranscriptSurface, Mode=OneWay}\"", xaml);
+        Assert.Contains("x:Load=\"{x:Bind ViewModel.ShouldLoadConversationInputSurface, Mode=OneWay}\"", xaml);
         Assert.Contains("Unloaded=\"OnMessagesListUnloaded\"", xaml);
         Assert.Contains("private void OnMessagesListUnloaded", codeBehind);
         Assert.DoesNotContain("PointerPressed=\"OnMessagesListPointerPressed\"", xaml, StringComparison.Ordinal);