ImageEngine/cortex — pull request #188 by davidsminor (2013-12-03 20:31:46+00:00)
Title: Added IECoreGL::Selector::push/popIDShader()

ID shaders weren't being reverted correctly in certain situations involving ribbon curves, so Selector::loadIDShader() has been deprecated and replaced by Selector::pushIDShader(), which can be reverted using Selector::popIDShader()