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After checking for rendered_surface, the call to gtk_css_node_get_style can invalidate the style and result in rendered_surface being set to NULL. This was result in some icon views appearing blank on Endless OS on armv7hl, and this error: Gtk-CRITICAL **: gtk_css_style_render_icon_surface: assertion 'surface != NULL' failed Call gtk_css_node_get_style earlier to ensure we always pass a valid surface to gtk_css_style_render_icon_surface. https://bugzilla.gnome.org/show_bug.cgi?id=765649 https://phabricator.endlessm.com/T13524
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