FileDialog: add Back/Forward buttons, add message for inaccessible folders. #47163
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Follow up to #47056, but independent of it.
Make file dialog more usable in macOS sandboxed apps.
Back
/Forward
buttons (backport fromEditorFileDialog
), without these, the only way to navigate out of inaccessible folders is entering full path manually.DirAccess
,is_readable
/is_writable
(Unix implementation only) for inaccessible folder detection.