core: fix line number references

jadx-core/src/main/java/jadx/core/codegen/CodeWriter.java

@@ -14,6 +14,7 @@ import org.slf4j.LoggerFactory;
 
 import jadx.api.CodePosition;
 import jadx.core.dex.attributes.nodes.LineAttrNode;
+import jadx.core.utils.StringUtils;
 import jadx.core.utils.files.FileUtils;
 import jadx.core.utils.files.ZipSecurity;
 
@@ -93,6 +94,15 @@ public class CodeWriter {
 		return this;
 	}
 
+	public CodeWriter addMultiLine(String str) {
+		buf.append(str);
+		if (str.contains(NL)) {
+			line += StringUtils.countMatches(str, NL);
+			offset = 0;
+		}
+		return this;
+	}
+
 	public CodeWriter add(String str) {
 		buf.append(str);
 		offset += str.length();

jadx-core/src/main/java/jadx/core/codegen/MethodGen.java

@@ -170,7 +170,7 @@ public class MethodGen {
 				if (cause != null) {
 					code.newLine();
 					code.add("/*");
-					code.newLine().add("Error: ").add(Utils.getStackTrace(cause));
+					code.newLine().add("Error: ").addMultiLine(Utils.getStackTrace(cause));
 					code.add("*/");
 				}
 			}

jadx-core/src/main/java/jadx/core/utils/StringUtils.java

@@ -202,4 +202,18 @@ public class StringUtils {
 	public static boolean notEmpty(String str) {
 		return str != null && !str.isEmpty();
 	}
+
+	public static int countMatches(String str, String subStr) {
+		if (str == null || str.isEmpty() || subStr == null || subStr.isEmpty()) {
+			return 0;
+		}
+		int subStrLen = subStr.length();
+		int count = 0;
+		int idx = 0;
+		while ((idx = str.indexOf(subStr, idx)) != -1) {
+			count++;
+			idx += subStrLen;
+		}
+		return count;
+	}
 }