textview: Make GTK_TEXT_WINDOW_PRIVATE public
The GTK_TEXT_WINDOW_PRIVATE enumeration value is really *not* private. Internally, it's used as a simple "invalid value" marker, and application and library developers are supposed to use it as such in their own code. Let's just document it, and since the GtkTextView documentation and internals go a long way to state the fact that it should not be used as an argument value, let's add some pre-condition checks as well. This commit fixes GtkSourceView's use of GTK_TEXT_WINDOW_PRIVATE as default value for a GObject property that was broken by the change in glib-mkenums to honor the `/*< public >*/` and `/*< private >*/` trigraphs.
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