No, it’s not about window decorations
I just enabled the blur effect by default for the beta cycle. If your graphics card at least supports the extension GL_ARB_fragment_program (check with glxinfo) you should see the blur behind Plasma tooltips, etc.
Please give it a try and please report issues. A blur effect could cause slowness and artifacts and we would like to know of them before the release. I hope we won’t have to disable the effect again. Speaking of new cool effects: Fredrik did not only contribute a new blur effect, but also added an awesome shader to the taskbar thumbnails, so they should look much better. Unfortunately there is a small issue only present with NVIDIA driver so the improved thumbnails are only used for RGBA windows. I’m pretty sure we will fix this issue – perhaps even before beta tagging (I just have to recompile complete trunk to test some ideas). And sorry for not presenting a picture – my trunk is really broken at the moment
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