Cannot easily type an Enum range when "Enable auto activation" for code assist is enabled

Another case similar to #676.

Consider this enumeration:

package test33;

public enum MyEnum {
  FOO, BAR;
}

And assume you want to type this:

package test33

class Test33 {

	void foo() {
		(MyEnum.FOO..MyEnum.BAR).each {
			
		}
	}
}

When you start to type (MyEnum.FOO. and then you hit the second dot, this is what gets inserted: (MyEnum.FOO.BAR..

I see two problems here:

• in general, having code assist propose BAR when you are at MyEnum.FOO. doesn't make sense to me (this happens even outside the range context)
• I still think . as a triggering character should simply be disabled whenever preceded by another dot, as discussed in #676.

Reproduce the issue in Eclipse using the Java MyEnum and Groovy Test33 examples, with code-assist auto activation enabled. Check that typing a second dot does not insert BAR or trigger completion; done means the enum range can be entered without the unwanted insertion.