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On Windows 7, when GLFW framebuffer transparency and the DWM are enabled but DWM transparency is disabled (i.e. when the Transparency setting is disabled under Personalization > Color), the contents of the framebuffer is combined with the last frame using additive blending instead of replacing the previous contents. This commit limits GLFW framebuffer transparency on Windows 7 to when DWM transparency is enabled, removing the previous workaround of setting a layered window color key that led to rendering artifacts. Fixes #1512.
