[Bug 1715586] Re: Fix shrinking behavior in rrCheckPixmapBounding

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** Tags added: patch

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Title:
  Fix shrinking behavior in rrCheckPixmapBounding

Status in HWE Next:
  New
Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  [Impact]
  When using extended mode on an slave-output connected external monitor, RRSetCrtc calls rrCheckPixmapBounding, which shrinks the output area. It makes the slave-output configured to scan-out an area which completely falls outside of the screen-pixmap, and end up with
  a black display on the external monitor.

  We need these two commits:
  a46afee84d45fbff4e4dad9376afc95bbcc31d7c randr: rrCheckPixmapBounding: do not shrink the screen_pixmap
  3b624aa9a9df86dc7d48149e0f18ca223b4355f1 randr: rrCheckPixmapBounding: Do not substract crtc non 0 x,y from screen size

  [Test Case]
  Enable NVIDIA PRIME, plug an external monitor, and change to extended mode.

  [Regression Potential]
  There should be none, the shrinking behavior wasn't right at the first place.

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