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backends/drm: fix blob updating

Xaver Hugl requested to merge work/zamundaaa/dumb-blob into master

@nicolasfella @ngraham I managed to reproduce your problem, and found the most dumb bug imaginable. This should fix the problems you're seeing

Two things about the code were wrong:

  1. m_current is used in updateBlob() but was only updated afterwards. This caused most of the problems
  2. the assumption that the property having the same ID means it has the same blob contents is not always true

BUG: 449285

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