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Fix mapped status tracking for subsurfaces

Vlad Zahorodnii requested to merge work/subsurface-map-unmap into master

A subsurface should be considered mapped only if it has a buffer attached and its parent is also mapped.

Currently, mapped status logic in SurfaceInterface is somewhat broken for sub-surfaces. For example, the mapped() signal will be emitted even if the sub-surface should be considered unmapped according to the spec.

Draft as I need to verify that this doesn't break key kde apps (kmail) that are known for using subsurfaces. Plasma shouldn't be affected by QTBUG-52192.

Edited by Vlad Zahorodnii

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