Eliminate deprecated FilenameIndex#getVirtualFilesByName method usage

[bohdan-harniuk]

Is your feature request related to a problem? Please describe.

The com.intellij.psi.search.FilenameIndex#getVirtualFilesByName(com.intellij.openapi.project.Project, java.lang.String, com.intellij.psi.search.GlobalSearchScope) method is deprecated. It is used in the: com.magento.idea.magento2plugin.reference.provider.FilePathReferenceProvider#getReferencesByElement.

Describe the solution you'd like (*)

1. Eliminate usage of deprecated method.
2. Do code refactoring of the file (just semantic refactoring, do not break the logic)

Mainline branch: 4.3.0-develop

[m2-assistant]

Hi @bohdan-harniuk. Thank you for your report.
To speed up processing of this issue, make sure that you provided sufficient information.

Add a comment to assign the issue: @magento I am working on this

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[doninAtwix]

@magento I am working on this