The option to display an action button as a menu separator has only effect for sub-actions.
I find it hard to make it clear that certain actionbuttons can be considered as grouped. A horizontal menu separator could make this more clear.
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I propose for Sub Actions menu to use the same style (background color, borders and font), which is set in the properties of Action Bar. Now for Sub Actions menu used "system" style (from the operating system), even when the properties of the Action Bar indicated "Use database settings" or ...