Fading patches are not synchronized with fading nodes

[civanT]

When a node starts fading in or out, image/video patches become noticeably different in transparency.

This can be reproduced at any scene by looking at a patch and fading out the node.

A simple Lua function to test this is (put it into main.lua):

function testFade()
  node=currentNode()
  node:setFadeSpeed(300)
  node:fadeOut()
end