Unevaluated Image Shader Node keeps updating in pipline - leads to exception

[rmtttt]

I think there a few issues actually, for more details you better check the patch. To reproduce:

1. Apply any texture effect to any texture;
2. Render the result to a TempTarget;
3. Use the TempTarget Buffer as a texture on other effect and render it on screen - effect should be connected with output renderer through group node.
4. Turn off Evaluate of texture effect;
5. Turn off and then turn on again the group which is connected to output renderer.

TextureEffects_test.zip

vvvv_50beta38.1_x64 (the same with latest alpha) latest dx11 win10 gtx 1080ti