D27788: Implement EGL_KHR_partial_update and EGL_EXT_swap_buffers_with_damage

apol added a comment.


  In D27788#638127 <https://phabricator.kde.org/D27788#638127>, @zzag wrote:
  
  > This is still not a good reason for pushing the current patch as is. The current API of aboutToStartPainting() suggests that it's called before KWin starts recording rendering commands and after determining what parts of the screen are going to be updated, but it's not entirely true because the scene may call paintBackground() before aboutToStartPainting().
  
  
  Would you prefer another name? How about `prepaintDone`?

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D27788

To: apol, #kwin, #plasma:_mobile
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