Better folder selection in FileExplorer

[GrunyD]

The Checkbox next to a folder now selects the folder. It doesn't select all its contents. There is no button to automatically select all contents of the folder.
Folder doesn't open when selected.
There is no '.' file in folder.
There is a feature allowing you to quickly select a large amount of files within the same folder, if you hold shift. It also allows you to deselect files in the same way.
Python raises ValueError if file_count = 'single', but value is a iterable of multiple files.

Description

Please include a concise summary, in clear English, of the changes in this pull request. If it closes an issue, please mention it here.

Closes: #11390

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[freddyaboulton]

HI @GrunyD ! Thanks for the PR. The change in checkbox behavior is a breaking change so this PR cannot be merged as is. In your original issue you mentioned :

Also another problem arises as mentioned at the end of the #9835. If you let people to only see folders, it is not possible to select them.

That would be a welcome bug fix in this PR!

[GrunyD]

I am not sure I follow. It is a breaking change, but some different behaviour would be a welcome bug fix? Could you be more specific, please? Can I somehow change it so it still behaves like I want, but isn't breaking change? What exactly is the problem?

[freddyaboulton]

The Checkbox next to a folder now selects the folder. It doesn't select all its contents.

This is a breaking change. We should not change the behavior of the checkbox in this way. However, you mentioned that if the glob pattern allows for only directories, it is not possible to to select an individual directory. Let's fix that in this pr.

You mentioned that you think using a . to indicate the directory is confusing. Maybe we can include the directory name? We can discuss in a separate PR.

[freddyaboulton]

Going to close for lack of follow up but we welcome a contribution incorporating the comment above!