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platforms/drm: Refactor event dispatching code

Vlad Zahorodnii requested to merge work/drm-no-lambda into master

There are a couple of reasons not to use the lambda:

  • It is unnecessary. The DrmGpu has the DRM file descriptor
  • If a crash occurs somewhere in the lambda, the backtrace will be hard to read
  • Instead of processing events in the destructor of the DrmBackend class, we should keep dispatching events without involving QCoreApplication::processEvents() until all page flips are completed.

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