If you omit the argument (or pass in an empty string), the dialog should remember the last directory:
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The tr function is used for translating user-visible strings. You can omit it if you won’t ever be providing translations for your application.
EDIT:
It seems that the start directory may not be automatically remembered on all platforms/desktops, depending on whether you use the native dialog or not. If Qt’s built-in dialog is used, the start directory should always be automatically remebered on all platforms (even between invokations of the application). To try the non-native dialog, do:
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Alternatively, you can use the QFileDialog constructor, which will always create a non-native dialog:
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