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Simon McVittie authored
Because we calculate and cache CSS properties once per StThemeNode, and only a certain set of attributes can affect the CSS properties, it's advantageous for as many widgets as possible to share a single StThemeNode. Similarly, if a widget changes state and then changes back (e.g. gaining and losing the :hover pseudo-class), it should ideally get its original StThemeNode back again when it returns to the old state. Here, I'm using the StThemeContext as the location for a cache. StThemeNodes are currently never freed: this seems OK for Shell's usage (a finite number of IDs, classes, pseudo-classes and types). Bug: https://bugzilla.gnome.org/show_bug.cgi?id=687465 Reviewed-by: Jasper St. Pierre <jstpierre@mecheye.net>
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