I'm trying to find out what is the way to call this kind of button:
To be precise, I'm talking about a button which acts like a regular one for most of its area, but has also a "more" area, usually presented with an arrow. Clicking this other area opens a popup allowing to pick another action then the current one (in the screenshot case, a different color, but could be something else). After selecting another item in this popup, it becomes the default action, for the next time the main button area is pressed.
What would be the common way to call such type of button?