QFile::rename: use the open file's ID, instead of using the file name

To do that, we needed to add virtual id() in QAbstractFileEngine and
override it in QFSFileEngine. It might be useful to return other types
of IDs for the other file engines, but this commit does not attempt that
just yet.

Change-Id: I1eba2b016de74620bfc8fffd14ccafe0762b3c38
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/corelib/io/qabstractfileengine_p.h b/src/corelib/io/qabstractfileengine_p.h
index 48b3dec324..58fa776e49 100644
--- a/src/corelib/io/qabstractfileengine_p.h
+++ b/src/corelib/io/qabstractfileengine_p.h
@@ -141,6 +141,7 @@ public:
     virtual QStringList entryList(QDir::Filters filters, const QStringList &filterNames) const;
     virtual FileFlags fileFlags(FileFlags type=FileInfoAll) const;
     virtual bool setPermissions(uint perms);
+    virtual QByteArray id() const;
     virtual QString fileName(FileName file=DefaultName) const;
     virtual uint ownerId(FileOwner) const;
     virtual QString owner(FileOwner) const;