Fix for opening wrong directory when loading dependent actor from file in drag-drop mode.
Fixes #597 (closed).
Weirdly, haven't found out the exact cause. The MSceneManagementDialog::loadRequiredActorFromFile
function gets invoked in drag-drop mode and via the load actor button with exactly the same parameters, and it basically has a static behaviour.
But found a fix by converting the file passed as parameter to its directory. Then, for some reason, the correct folder appears.