current_folder added to open file / folder picker (#13596)

Co-authored-by: Herman Kirshin <herman.kirshin@jetbrains.com>

src/Avalonia.FreeDesktop/Avalonia.FreeDesktop.csproj

@@ -13,7 +13,7 @@
 
   <ItemGroup>
     <PackageReference Include="Tmds.DBus.Protocol" Version="0.15.0" />
-    <PackageReference Include="Tmds.DBus.SourceGenerator" Version="0.0.10" PrivateAssets="All" />
+    <PackageReference Include="Tmds.DBus.SourceGenerator" Version="0.0.11" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>

src/Avalonia.FreeDesktop/DBusSystemDialog.cs

@@ -20,27 +20,30 @@ namespace Avalonia.FreeDesktop
                 return null;
 
             var dbusFileChooser = new OrgFreedesktopPortalFileChooser(DBusHelper.Connection, "org.freedesktop.portal.Desktop", "/org/freedesktop/portal/desktop");
+            uint version = 0;
             try
             {
-                await dbusFileChooser.GetVersionPropertyAsync();
+                version = await dbusFileChooser.GetVersionPropertyAsync();
             }
             catch
             {
                 return null;
             }
 
-            return new DBusSystemDialog(DBusHelper.Connection, handle, dbusFileChooser);
+            return new DBusSystemDialog(DBusHelper.Connection, handle, dbusFileChooser, version);
         }
 
         private readonly Connection _connection;
         private readonly OrgFreedesktopPortalFileChooser _fileChooser;
         private readonly IPlatformHandle _handle;
+        private readonly uint _version;
 
-        private DBusSystemDialog(Connection connection, IPlatformHandle handle, OrgFreedesktopPortalFileChooser fileChooser)
+        private DBusSystemDialog(Connection connection, IPlatformHandle handle, OrgFreedesktopPortalFileChooser fileChooser, uint version)
         {
             _connection = connection;
             _fileChooser = fileChooser;
             _handle = handle;
+            _version = version;
         }
 
         public override bool CanOpen => true;
@@ -58,6 +61,8 @@ namespace Avalonia.FreeDesktop
             if (filters is not null)
                 chooserOptions.Add("filters", filters);
 
+            if (options.SuggestedStartLocation?.TryGetLocalPath()  is { } folderPath && _version >= 4)
+                chooserOptions.Add("current_folder", new DBusVariantItem("ay", new DBusByteArrayItem(Encoding.UTF8.GetBytes(folderPath + "\0"))));
             chooserOptions.Add("multiple", new DBusVariantItem("b", new DBusBoolItem(options.AllowMultiple)));
 
             objectPath = await _fileChooser.OpenFileAsync(parentWindow, options.Title ?? string.Empty, chooserOptions);
@@ -120,7 +125,9 @@ namespace Avalonia.FreeDesktop
                 { "directory", new DBusVariantItem("b", new DBusBoolItem(true)) },
                 { "multiple", new DBusVariantItem("b", new DBusBoolItem(options.AllowMultiple)) }
             };
-
+            if (options.SuggestedStartLocation?.TryGetLocalPath()  is { } folderPath && _version >= 4)
+                chooserOptions.Add("current_folder", new DBusVariantItem("ay", new DBusByteArrayItem(Encoding.UTF8.GetBytes(folderPath + "\0"))));
+            
             var objectPath = await _fileChooser.OpenFileAsync(parentWindow, options.Title ?? string.Empty, chooserOptions);
             var request = new OrgFreedesktopPortalRequest(_connection, "org.freedesktop.portal.Desktop", objectPath);
             var tsc = new TaskCompletionSource<string[]?>();