Gandulf Kohlweiss

I encountered a behaviour that seems to be against the definition for the usage of legacy keys. I have an IdMask with legacy keys for backward compatibility, which works fine...

Fix #12743 Do not render empty command containers (Menubar, Toolbar, MenuButton,...) [Draft]

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Initial Draft PR regarding not (always) rendering containers that contain no rendered children. see #12743

AbstractMenu: "renderEmptyContainer" option to prevent empty menus from being rendered

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### Description I often encounter cases were I use some kind of menu/container component (MenuButton, Menubar, Toolbar, ...) with a list of menu items that are either rendered or not...