This patch store and render the GtkToolButton/GtkMenuButton of notebookbar*.ui show/hide property in registrymodifications.xcu. The patch also gives a solution to copy the notebookbar*.ui file in user directory from share directory provided file is absent in user directory.The patch also uses libxml2 library and write i.e change the property of uiitem(GtkToolButton/GtkMenuButton) in notebookbar*.ui files present in user directory. Change-Id: I518f37fc858250a04fafd2a4475e3ed03185f6ff Reviewed-on: https://gerrit.libreoffice.org/72698 Tested-by: Jenkins Reviewed-by: Szymon Kłos <szymon.klos@collabora.com>