Handle create option on Enter in virtualized combobox

In virtualized mode, Enter always selects filteredItems[highlightedIndex], but the create option is rendered separately and never included in the highlighted index. This means when allowCreation is true and the search text doesn’t match an existing item (showCreateOption), pressing Enter won’t create the new item (it will no-op on an empty list or select the first existing item), which is a regression from the non-virtualized cmdk behavior where the create item is keyboard-selectable.

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Handle create option on Enter in virtualized button select

The virtualized key handler always uses filteredItems[highlightedIndex] on Enter and never considers the create option that appears when creatable is true and the search text is new. As a result, keyboard creation is broken in virtualized mode (Enter does nothing when the filtered list is empty or selects the first existing item instead of creating), which differs from the non-virtualized cmdk behavior.

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Create option unreachable via keyboard in virtualized mode

Medium Severity

The virtualized keyboard Enter handler only accesses filteredItems[highlightedIndex] and always passes isNew: false to handleSelectItem. The "create new" option is rendered separately in ComboboxMenuItems (via its own CommandItem with onSelect={() => onSelectItem(searchValue.trim(), true)}), but highlightedIndex only tracks position within filteredItems. This makes the create option completely unreachable via keyboard navigation when virtualization is active, breaking the VirtualizedWithCreation use case in both components.

PageDown sets invalid negative index when list empty

Low Severity

The PageDown handler uses Math.min(prev + 8, filteredItems.length - 1) which returns -1 when filteredItems is empty (since Math.min(8, -1) equals -1). Unlike the End key handler which uses Math.max(0, ...) for protection, and the useEffect which has an explicit if (filteredItems.length === 0) return 0 guard, PageDown lacks empty list handling. This causes highlightedIndex to become -1, resulting in no visual highlighting and Enter doing nothing until the user presses ArrowDown to recover.