Update BclLauncher.cs to use ArgumentList property (#19713)

Using the ArgumentList property avoids having to escape spaces and special characters, which would otherwise cause the open command to fail and either split the argument string or not find the required files and folders with special characters.

Co-authored-by: Julien Lebosquain <julien@lebosquain.net>

Author: tompnub

src/Avalonia.Base/Platform/Storage/FileIO/BclLauncher.cs

@@ -49,13 +49,17 @@ private static bool Exec(string urlOrFile)
         }
         else if (OperatingSystemEx.IsWindows() || OperatingSystemEx.IsMacOS())
         {
-            using var process = Process.Start(new ProcessStartInfo
+            var info = new ProcessStartInfo
             {
                 FileName = OperatingSystemEx.IsWindows() ? urlOrFile : "open",
-                Arguments = OperatingSystemEx.IsMacOS() ? $"{urlOrFile}" : "",
                 CreateNoWindow = true,
                 UseShellExecute = OperatingSystemEx.IsWindows()
-            });
+            };
+            // Using the argument list avoids having to escape spaces and other special 
+            // characters that are part of valid macos file and folder paths.
+            if (OperatingSystemEx.IsMacOS())
+                info.ArgumentList.Add(urlOrFile);
+            using var process = Process.Start(info);
             return true;
         }
         else