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A folder item is a regular item, which - in addition to its tasks defined by its type - contains other items. Folder items may be opened or closed by clicking on a visual indicator displayed right next to an item's icon (not shown in the mockup below).
When using a keyboard, clicking the right arrow key opens the currently highlighted folder item, expanding the tree view to also show its contained sub items. Clicking the left arrow key closes the folder item and thus collapses to view again to only show the folder item itself.
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Likewise, items of a folder page (see "opening, closing folder pages" above), which will become visible by opening it, could already be preloaded in the background.
Mockups
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Notes:
- the visual indicator for opening and closing a folder item is not shown
Open questions
Inline editing??
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