Return ImGuiMultiSelectIO structure. Lifetime: don't hold on ImGuiMultiSelectIO* pointers over multiple frames or past any subsequent call to BeginMultiSelect() or EndMultiSelect(). Passing 'selection_size' and 'items_count' parameters is currently optional. - 'selection_size' is useful to disable some shortcut routing: e.g. ImGuiMultiSelectFlags_ClearOnEscape won't claim Escape key when selection
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