JSON转代码内容文本时，自动分行

tools/apps/hgjson/hgjsonDlg.cpp

@@ -7054,8 +7054,22 @@ void ChgjsonDlg::OnBnClickedButton2()
 		pos = txt.find("\\u", pos + 3);
 	}
 
+	// divide into multi-lines with 16KB per line ...
+	int	lines = 1;
+	pos = txt.length();
+	while (pos > 16 * 1024)
+	{
+		pos -= 12 * 1024;
+		while (txt[pos - 1] == '\\')
+			pos++;
+		txt.insert(pos, "\r\n");
+		lines++;
+	}
 	file_util::set_clipboard(txt.c_str(), txt.length());
-	MessageBox(TEXT("JSON text has set to clipboard already"));
+
+	TCHAR	msg[128] = { 0 };
+	_stprintf(msg, TEXT("%d lines"), lines);
+	MessageBox(TEXT("JSON text has set to clipboard already"), msg);
 }