i use gtk_widget_add_accelerator for toolbar buttons to define hot keys.
Not all toolbar buttons will show on the toolbar when the window is resized very small. some buttons will appear in a dropdown list on the toolbar.
I find that the hot key will not work when the button is collapsed. It will work again when i maximize the window and the toolbar expanded to show all buttons.
Are there any configuration so that the hotkey is effective even when the button collapsed into the dropdown list?