Gtk.EntryCompletion.prototype.set_popup_set_width

function set_popup_set_width(popup_set_width:Boolean):void {
    // Gjs wrapper for gtk_entry_completion_set_popup_set_width()
}

Sets whether the completion popup window will be resized to be the same width as the entry.

Since 2.8

popup_set_width

true to make the width of the popup the same as the entry