https://bugs.documentfoundation.org/show_bug.cgi?id=162673

--- Comment #2 from Caolán McNamara <[email protected]> ---
The problem is SalGtkFilePicker::UpdateFilterfromUI where mnHID_FolderChange
and mnHID_SelectionChange are 0 so UpdateFilterfromUI doesn't do anything

Those are 0 because of the reasons mentioned in
https://cgit.freedesktop.org/libreoffice/core/commit/?id=71dd1d72358a862b4cf36d5014624ab9d8c8a402

Changing 

    if (!mnHID_FolderChange || !mnHID_SelectionChange)
        return;

to

#if !GTK_CHECK_VERSION(4, 0, 0)
    // Update the filtername from the users selection if they have had a chance
to do so.
    // If the user explicitly sets a type then use that, if not then take the
implicit type
    // from the filter of the files glob on which he is currently searching
    if (!mnHID_FolderChange || !mnHID_SelectionChange)
        return;
#endif

in vcl/unx/gtk3/fpicker/SalGtkFilePicker.cxx probably gets past that hurdle.
But then there are possible further problems that might arise.

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