Dolphin's main View, Gwenview and digiKam's Browse views, Plasma's Folder View, the Open/Save dialogs' main view, and the MauiKit Index app's main view all have similar behaviour/goal: they show a list or grid of icons (usually with thumbnails) in a specific folder, allow navigating through the directory hierarchy, and manipulate the items with contextual actions.
Some offer features that others don't. For example Dolphin and Index offer to show files in a list instead of a grid, while Gwenview lacks this feature. Dolphin and Gwenview allow selecting individual items with an overlay selection marker, while the Open/Save dialogs do not. And so on.
By extracting and unifying the different implementations, one could de-duplicate the code as well as unify the look and behaviour across applications while allowing easier maintenance.