Case sensitive in directory name it is a issue

[Piotr Hoppe]

When you have in the project two directories with the same name but one 
of them uses lowercase letters and the second uses the uppercase letter, 
for example backend and Backend, so these name are differ only size of 
letters.
Then in the project tree you can see only one of this directories with 
them content.

In the project tree It should be visible both directories.
Earlier, I have already reported a similar problem 
https://netbeans.org/bugzilla/show_bug.cgi?id=268044

This issue occurs in the NetBeans 9.0 when I works on the PHP projects.

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Piotr Hoppe