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

app/MindWork AI Studio/Tools/Rust/ShareFileResponse.cs

@@ -0,0 +1,9 @@
+namespace AIStudio.Tools.Rust;
+
+/// <summary>
+/// The answer of the runtime to a request to share a file through the share sheet of the
+/// operating system.
+/// </summary>
+/// <param name="Outcome">What became of the request.</param>
+/// <param name="Issue">Why the share sheet did not open; empty when it opened.</param>
+public sealed record ShareFileResponse(ShareSheetOutcome Outcome, string Issue);

app/MindWork AI Studio/Tools/Rust/ShareSheetOutcome.cs

@@ -0,0 +1,30 @@
+namespace AIStudio.Tools.Rust;
+
+/// <summary>
+/// What became of a request to open the share sheet of the operating system. Keep in sync with
+/// ShareOutcome in runtime/src/share_sheet.rs.
+/// </summary>
+public enum ShareSheetOutcome
+{
+    /// <summary>
+    /// The runtime sent an outcome the app does not know, or none at all. The app reads this as a
+    /// failure, never as an opened share sheet.
+    /// </summary>
+    UNKNOWN,
+
+    /// <summary>
+    /// The operating system opened its share sheet for the file.
+    /// </summary>
+    OPENED,
+
+    /// <summary>
+    /// The share sheet could not be opened, or the request was invalid.
+    /// </summary>
+    FAILED,
+
+    /// <summary>
+    /// Windows accepted the share request, but its share sheet never asked for the file. Windows
+    /// reports no error then, and the share sheet simply does not appear.
+    /// </summary>
+    UNRESPONSIVE,
+}