Better handle "Failed to create melted file" Rakaly error (#1989) #patch

Sentry event ID: 8c7ab9ed5e204ef0a90421c059fc05c9

ImperatorToCK3/Helpers/RakalyCaller.cs

@@ -116,6 +116,19 @@ public static void MeltSave(string savePath) {
 			if (stdErrText.Contains("There is not enough space on the disk.")) {
 				throw new UserErrorException($"{exceptionMessage} There is not enough space on the disk.");
 			}
+
+			if (stdErrText.Contains("Failed to create melted file")) {
+				// Try to copy the file to the converter's temp folder before melting.
+				var saveDisk = Path.GetPathRoot(savePath);
+				var converterDisk = Path.GetPathRoot(Directory.GetCurrentDirectory());
+
+				if (saveDisk != converterDisk) {
+					const string fallbackSavePath = "temp/save_to_be_melted.rome";
+					File.Copy(savePath, fallbackSavePath, overwrite: true);
+					MeltSave(fallbackSavePath);
+					return;
+				}
+			}
 
 			if (stdErrText.Contains("memory allocation of")) {
 				exceptionMessage += " One possible reason is that you don't have enough RAM.";