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Right now, Dolphin creates two types of previews for directories: when the directory contains multiple files with a thumbnail, it will display a 2x2 preview grid with up to 4 thumbnails. If there is a single file in the directory with a thumbnail, it will put that thumbnail on top of the directory icon.

- I'd like the option for Dolphin to also obey the "folder.jpg" convention: if there is a picture named "folder.jpg" in the directory, that picture will be used for a single thumbnail, even if other files with thumbnails are present in the directory.

- It would also be nice to have an option to turn on/off the current feature that randomly slants folder thumbnails, so they can be a little larger and fill more of the available space.

- It would be nice to have a choice between different preview grids for multi-thumbnail review, say to also have 3x3 or even 4x4 for large/high DPI screens. Or perhaps this could be automatically changed when you raise the icon size.

In my opinion, best option is animate slide effect of thumbnail. We display four first, but since 4 seconds pass, we show previews of other four files.