Replace gtk_widget_show_all with gtk_widget_show
gtk_widget_show_all is deprecated, so this app no longer builds with deprecated warnings on. This patch should updates to the non-deprecated gtk_widget_show, which takes over the behaviour of show_all.
At least I think it does, I'm not 100% and couldn't find it in the docs, but I recall that being said at GUADEC
Closes #4 (closed)
Edited by Tom Coldrick