This bug was totally expected...
I don't think we have the luxury of GL clipping planes in ES. We could
however modify the renderer to limit the glViewport to each window's
region (which annoyingly also changes the coordinates ands
transformations). Some work would be required there, possibly in our
scene architecture to expose window vs renderable information, and also
would need separate re-implementation in every compositor/renderer. So
that's both Mir and QtMir.
** Also affects: qtmir (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mir
Importance: High => Medium
** Changed in: qtmir (Ubuntu)
Importance: Undecided => Medium
** Changed in: mir
Status: New => Triaged
** Changed in: qtmir (Ubuntu)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/1667690
Title:
RenderSurfaces can be rendered outside the extents of their containing
window
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