If two or more classes in the same project have the same unqualified name, then after editing one of them can't be found in index the edited one class

steps to reproduce(as I showed you today):
- create PHP project
- create PHP class (use file wizard)
- create subfolder with arbitrary name
- copy/paste the existing class into new subfolder

So, now you have two classes with same name. 

- start editing on of those classes. Imagine its body like this:
class Config {
 const AAA = 1;
 
 | 

}
- use code completion at the position of caret
- add new line spaces and repeat the previous step (CC)
- as soon as no methods appears in CC then you trapped the problem