Eclipse text search mostNestedProject should not include closed projects when detecting which files to open

[MKamelEJ]

Summary

When having nested projects some are open and some are closed when searching for textual content:

• the textual search shows the results of the open projects only
• but when you double click on the search results it will send you to the mostNestedProject which may be closed
• Resulting in opening an empty editor

Steps to reproduce

• Import a project from existing workspace (A)
• Create another project (B)
• Drag folder from A project into B
• Select Link to files and folders
• Search for a keyword in that folder then click to open it

What is the current bug behavior?
The result is resource "A/file.txt" doesn't exist

What is the expected correct behavior?
It should open the file in the open projects only.

Relevant logs and/or screenshots

org.eclipse.search.internal.ui.text.FileSearchPage.mostNestedEquivalent(IFile)

This should check the file exists in an open projects only

[mickaelistria]

Your analysis seems correct, can you please submit a pull request with the suggested change?