view: fix critical message when a NULL StyleScheme is set
_gtk_source_style_scheme_apply() doesn't accept a NULL StyleScheme, which is normal. Factor out the update_style() function, to avoid code duplication, since the code was correct at one place and incorrect at another place. https://bugzilla.gnome.org/show_bug.cgi?id=760984
parent
b3826d87
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