Eclipse Debug Arguments: double dashes are replaced by single long dash automatically. How to disable smart dashes substitution?

On Eclipse Oxygen, when input double dash -- into "Arguments" of "Debug Configurations...", It substitutes double dash -- with single long dash —
It is really annoying. You cannot even input the correct arguments. The only way to make it work is to disable "Smart Dashes" See below:

• Right click the Arguments area to open the context menu
• Select "Substitutions" then uncheck "Smart Dashes"
• Now you should be able to input double dashes