Test: explorer shows hidden files if they are open

[isidorn]

Refs: #92090

• any os @deepak1556
• any os @bpasero

Complexity: 2

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If a file is hidden (via files.exclude ) and it is open and visible in the editor area Explorer will now show it and its parent chain.

Have some files and folders hidden via files.exclude.
Have a way to open those hidden files. For example via quick open, by setting search.exclude to contradict the files.exclude setting.

Open some of the hidden files in an editor and verify:

• Those files and their parents are shown in the explorer using a dimmed color
• As soon as the file is no longer visible it gets hidden in the explorer
• Make sure siblings of opened files are not shown. More precisly if A is a hidden folder, and A/b.txt and A/c.txt are its children. Make sure that opening b.txt does not show c.txt in the explorer

[deepak1556]

Verified on linux 👍