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If texture allocation fails (e.g. on an old GPU with size limit 2048) then `update_fbo` would return `FALSE` but leaves `priv->offscreen` as non-NULL. So the next paint will try to use the offscreen with a `NULL` texture and crashes. The solution is simply to ensure that `priv->offscreen` is NULL if there is no `priv->texture`, so the default (non-offscreen) paint path gets used instead. Bug reported and fix provided by Gert van de Kraats. https://launchpad.net/bugs/1795774