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[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

As far as I can tell "-rootless" mode actually is not implemented yet. I
can't make it crash but I can see that it mistakenly maps each X Window
(some of which could be menus or even individual widgets like in xedit)
to separate Mir surfaces. If we're going to continue on this path then
Mir needs full sub-surface (child/embedded surfaces) placement support.

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https://bugs.launchpad.net/bugs/1472097

Title:
  XMir crashes when running with -rootless

Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  Ted has run into problems trying to integrate XMir with Unity8. When
  he starts an app, XMir aborts in compCopyWindow. (Log attached)

  This seems to be because compCopyWindow has been called before
  compConfigNotify (which in turn call compReallocPixmap, and set
  cw->oldx to valid values). This might be an initialisation order
  problem in XMir.

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