"Resource is currently edited in another editor" after saving ANTLR grammar file

Question

I am using antlr4ide plugin with Eclipse Luna. Every time I save the ANTLR4 grammar file Eclipse shows a dialog box "The resource is currently edited in another editor. Do you want to continue?" Any hint on how to fix it?

Thremmatology

I experienced the same behavior editing less files using an editor packed in a plugin. I opened the file with the eclipse standard text editor which do not suffer that problem. Maybe you want to give it a try because the dialog box appearing every time is very annoying. – Clea

I did that but I am losing syntax highlighting – Thremmatology