We need a way to declare a split button (an action button with a drop down menu accessible by clicking the down arrow next to the button. (like. the Flags split menu in Outlook (button can clear the flag while dropdown menu can select a flag).
The manifest could be a menu with an ExecuteFunction at the item level. If an execute function is present, the rendering is a Split-Button otherwise it's a classic menu.
A example taken from New Outlook for MacOS. The split button exists, but it's unavailable to office.js add-ins.
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Yes, please. The absence of split buttons and toggle/press buttons hurts a lot. We're doing awkward things like menus and toggle "menus" for things our users can do much more easily in our VSTO add-in.
