fix(raw): a stale open can no longer feed the picker another device's config

tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Raw/FakeRawTreeService.cs

@@ -20,14 +20,26 @@ internal sealed class FakeRawTreeService : IRawTreeService
     public Func<string, (string DriverType, string MergedConfigJson)?> OnLoadMergedProbeConfig { get; set; } =
         _ => throw new NotImplementedException();
 
+    /// <summary>
+    ///     Optional asynchronous override of <see cref="OnLoadTagForEdit"/>. The sync delegates above
+    ///     complete inline, which cannot express two opens overlapping on one modal instance — set this to
+    ///     gate a load on a <see cref="TaskCompletionSource"/> and interleave the second open.
+    /// </summary>
+    public Func<string, Task<RawTagEditDto?>>? OnLoadTagForEditAsync { get; set; }
+
+    /// <summary>Optional asynchronous override of <see cref="OnLoadMergedProbeConfig"/>; see <see cref="OnLoadTagForEditAsync"/>.</summary>
+    public Func<string, Task<(string DriverType, string MergedConfigJson)?>>? OnLoadMergedProbeConfigAsync { get; set; }
+
     /// <inheritdoc/>
     public Task<RawTagEditDto?> LoadTagForEditAsync(string tagId, CancellationToken ct = default)
-        => Task.FromResult(OnLoadTagForEdit(tagId));
+        => OnLoadTagForEditAsync is { } async ? async(tagId) : Task.FromResult(OnLoadTagForEdit(tagId));
 
     /// <inheritdoc/>
     public Task<(string DriverType, string MergedConfigJson)?> LoadMergedProbeConfigAsync(
         string deviceId, CancellationToken ct = default)
-        => Task.FromResult(OnLoadMergedProbeConfig(deviceId));
+        => OnLoadMergedProbeConfigAsync is { } async
+            ? async(deviceId)
+            : Task.FromResult(OnLoadMergedProbeConfig(deviceId));
 
     /// <inheritdoc/>
     public Task<IReadOnlyList<RawNode>> LoadRootsAsync(CancellationToken ct = default)