[Bug 1971168] Re: [snap] Files on local network shares are not opened / written

[Jeremy Bícha]

** Description changed:

  [ Impact ]
  
  When the user is running a containerized application (like the snapped
  Firefox or Chromium), and tries to save a document, the xdg-desktop-
  portal-gnome backend does show remote drives (like SMB or SFTP ones),
  and allows to choose them, but then the save operation fails.
  
  The previous backend, xdg-desktop-portal-gtk, did work fine in these
  cases, because it returned the local path that corresponded to the local
  file exported by Gvfs using FUSE, so this behaviour is not only a
  serious bug, but also a regression.
  
  [ Test plan]
  Steps to reproduce:
  
- 1. Run Firefox or Chromium as a Snap package in Ubuntu 22.04
+ 1. Run Firefox as a Snap package in Ubuntu 22.04
  2. Have a SMB file server available where the network shares can be mounted just by clicking on the share in Nautilus file manager (smb:// protocol, usually mounted dynamically via `/var/run/user/.../gvfs/...`)
  3. Have one such share mounted and writable
- 4. Open any website containing images in Firefox / Chromium
+ 4. Open any website containing images in Firefox
  5. Right-click on an image and select "Save Image As..."
  6. In the file save dialog, navigate to the mounted share
  7. Assert content of network share is visible and browsable from within the save dialog
  8. Select "Save" at any folder in the network share
  
  Actual behavior:
  
  * File is not saved to selected network share location
  * No download entry is created
  * No error is shown
  
  Expected behavior:
  
  * File is saved to selected network share location
  * No error is shown
  
  [ Where problems could occur ]
  
  - If the remote drives aren't exported as local files by Gvfs using
  FUSE, the patch won't work and the behaviour will be the same than now.
  
  - Any hidden  bug in g_file_get_path() when managing remote drives could
  be triggered by this patch.
  
  [ Additional information ]
  
  * When saving to a folder on the local machine instead, saving works correctly as expected
  * In contrast to files, new folders that are created from within the save dialog are saved correctly on the network share
  * Similar situation when trying to open a file with Ctrl + O on a network share from Firefox / Chromium. After double-clicking e.g. an image file in the file dialog, the file dialog closes but nothing happens otherwise. Opening an image on a local folder works fine.

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Title:
  [snap] Files on local network shares are not opened / written

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