quicksilver/Quicksilver — pull request #1297 by skurfer (2012-12-17 16:04:35+00:00)
Title: file preview efficiency

The fallback value when no preview image is available for a file object was the "regular" icon from `NSWorkspace`. But it occurred to me that the regular icon is what gets used as the initial value while the background thread goes and looks for something better. If nothing better is found, there's no sense falling back to the icon that's already set and forcing the UI to redraw.

This should cut down on **a ton** of `QSObjectIconModified` notifications.