Fix error path returned when select '..' from file dialog

[Geequlim]

Fix #13203

[akien-mga]

That doesn't seem like the right fix to me. The issue is that .. is selected by default since . was removed in #13121. CC @Krakean

[Geequlim]

@akien-mga
In my opinion select .. to get the current showing directory is expect.
Of couse the checking for . could be removed.

[akien-mga]

In my opinion select .. to get the current showing directory is expect.

No, .. means "parent directory". If you select it, it's normal that you end up with the parent directory. That's why . was there in the first place. IMO #13121 should be reverted, if we don't like this Unix-style browser and want it more like Windows', we need to rethink it a bit, and that's too late for 3.0.

Alternatively, nothing should be selected by default when opening a folder, and an empty selection should behave as ..

[Geequlim]

We can hide the .. too. The dialog should never select an item with . or ...
Then have to add a button to go to parent directory like Qt does.

[akien-mga]

The problem is that unlike most other file dialogs in Qt, GTK, native Windows UI, etc., we need to be able to select folders and not only files. And quite often, people will want to select a folder by browsing inside it, instead of browsing to its parent and selecting the folder in the list.

So either we have . to be able to select the folder, or we should have support for deselecting so that no selection means "current folder".

[Krakean]

@Geequlim fixed in #13252 , take a look please, curious whether fix works fine & as expected for you.

[akien-mga]

Superseded by #13252.