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I'm trying to have a clickable button in the header-line. The code below works for the mode-line but not for the header line. Is there something specific to add?

(setq-default header-line-format
 (list `(:propertize " ☰ "
                    face       mode-line-mode
                    mouse-face mode-line-highlight
                    local-map  ,mode-line-major-mode-keymap)
       `(:propertize "%m " face mode-line)))
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A click on the mode-line does not generate the event sequence [mouse-1] but [mode-line mouse-1] and similarly a click on the header line generates the sequence [header-line mouse-1], so you need to tweak the mode-line-major-mode-keymap so it also reacts to event sequences like [header-line mouse-1]. For example with:

(define-key mode-line-major-mode-keymap [header-line]
            (lookup-key mode-line-major-mode-keymap [mode-line]))
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