Fix RCS1236

.editorconfig

@@ -1136,5 +1136,9 @@ dotnet_diagnostic.RCS1233.severity = warning
 # Optimize method call.
 dotnet_diagnostic.RCS1235.severity = warning
 
+# Use exception filter.
+dotnet_diagnostic.RCS1236.severity = warning
+
 # Use 'for' statement instead of 'while' statement.
 dotnet_diagnostic.RCS1239.severity = warning
+

OpenRA.Game/FileSystem/FileSystem.cs

@@ -109,10 +109,8 @@ namespace OpenRA.FileSystem
 
 				Mount(package, explicitName);
 			}
-			catch
+			catch when (optional)
 			{
-				if (!optional)
-					throw;
 			}
 		}
 

OpenRA.Game/Server/Server.cs

@@ -248,12 +248,9 @@ namespace OpenRA.Server
 					{
 						listener.Server.SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.IPv6Only, 1);
 					}
-					catch (Exception ex)
+					catch (Exception ex) when (ex is SocketException || ex is ArgumentException)
 					{
-						if (ex is SocketException || ex is ArgumentException)
-							Log.Write("server", $"Failed to set socket option on {endpoint}: {ex.Message}");
-						else
-							throw;
+						Log.Write("server", $"Failed to set socket option on {endpoint}: {ex.Message}");
 					}
 
 					listener.Start();