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How is a separator added to the main toolbar? I have no trouble adding an icon/item with tool-bar-add-item but can't find a way to add a separator.

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  • I removed tag [menu-bar]. Did you mean tool-bar or menu-bar?
    – Drew
    Sep 3 '20 at 4:41
  • What do you mean by "separator", here? Just some visible indication, e.g., to group icons? If so, you can probably just add an icon that looks like a separator, for a pseudo-tool that does nothing.
    – Drew
    Sep 3 '20 at 4:43
  • If you really do mean menu-bar, and not tool-bar, then see MenuBar+ (code). It provides a menu-bar divider, to separate local from global menus. You might check its code, for one way to do that. Look for menu-bar-divider-menu in the code.
    – Drew
    Sep 3 '20 at 4:49
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I have found how to do this. I had experimented with this before posting the question but thought that it didn't work because the toolbar is not automatically redrawn. The following does work.

(define-key-after (default-value 'tool-bar-map)
    [separator-4] menu-bar-separator) 

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