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We are mixing bool and fancy 3-in-1 func-set buttons in the outliner. So they would return different pushed state in ui_drag_toggle_but_pushed_state(). We now have a callback function that allows the button to set its own pushed_button_state callback function. Note: This is a bit of overkill since we are planning to change the 3-in-1 outliner buttons. That said, it may be nice to have, since in the future we can mix those buttons for other things. Reviewers: brecht Differential Revision: https://developer.blender.org/D4434