Fixed sharing plugins when the share dialog of the operating system does not respond (#1088)

app/MindWork AI Studio/Tools/Services/NativeShareService.cs

@@ -1,6 +1,40 @@
+using AIStudio.Tools.Rust;
+
 namespace AIStudio.Tools.Services;
 
-public sealed class NativeShareService(RustService rustService)
+/// <summary>
+/// Hands files to the share sheet of the operating system, and remembers when that share sheet
+/// failed.
+/// </summary>
+/// <remarks>
+/// A share sheet which hung once tends to stay broken: on Windows, it then accepts every further
+/// request without ever appearing, so the share button seems to do nothing at all. Once the share
+/// sheet failed or did not respond, AI Studio therefore exports plugin archives instead, until it
+/// restarts. This service is a singleton, so that the decision holds for every window.
+/// </remarks>
+public sealed class NativeShareService(RustService rustService, ILogger<NativeShareService> logger)
 {
-    public Task<bool> Share(string filePath) => rustService.ShareFile(filePath);
-}
+    private volatile bool isUnavailable;
+
+    /// <summary>
+    /// Whether the share sheet of the operating system can be used. Linux has none, and on Windows
+    /// and macOS it counts as unavailable once it failed or did not respond.
+    /// </summary>
+    public bool IsAvailable => !OperatingSystem.IsLinux() && !this.isUnavailable;
+
+    /// <summary>
+    /// Opens the share sheet of the operating system for a file.
+    /// </summary>
+    /// <param name="filePath">The plugin archive to share.</param>
+    /// <returns>What became of the request.</returns>
+    public async Task<ShareFileResponse> Share(string filePath)
+    {
+        var response = await rustService.ShareFile(filePath);
+        if (response.Outcome is ShareSheetOutcome.OPENED || this.isUnavailable)
+            return response;
+
+        this.isUnavailable = true;
+        logger.LogWarning("The native share sheet did not open ({Outcome}). Until AI Studio restarts, plugin archives are exported instead.", response.Outcome);
+        return response;
+    }
+}