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qt: handle special case with high precision scrolling in custom scroll handler

Fatih Uzunoğlu requested to merge fuzun/vlc:qt-flickablescrollhandler-improvements into master

It appears that at least with XWayland, pixel delta is reported as angle delta, and this information can be used to properly handle high precision scrolling.

I have heard that Mac OS was also problematic with this regard. I can't test it, but this may also fix the behavior on that platform.

This will fix scrolling behavior in at least these cases:

  • Smooth scrolling disabled, and high precision mouse/trackpad is used.
  • Smooth scrolling enabled (default). However, used Qt version is < 5.15.8, so custom scroll handler is force enabled for high precision scrolling.

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