If PM is a default browser, or if you drag and drop an image onto PM, the file should be displayed in the Preview window. The "contact sheet" view should be positioned to that image in the upper left corner of the thumb window. If subsequent images are dropped onto PM, the display should change to reflect the new image. It would be reasonable (if needed) to automatically open a new contact sheet directory.
Very often a person is "not working within' PM - for example, viewing windows thumbnails in a directory. If I drag and drop onto PM, I expect that the image should display automatically and quickly. If I double-click on the image, I also expect a similar and rapid display.
