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Use shared contexts for plasmashell

David Edmundson requested to merge work/shared_texture into master

Shared contexts allow us to share textures and vertex buffers between contexts (windows) this allows us to reduce memory in popups and alike.

To fully make use of this requires some follow up work in ManagedTextureNode for FrameSVG, but we should sitll get some benefit OOTB.

If shared contexts are not supported this fails gracefully - though we are relying on shared contexts within kwin for a release without issue.

It also should fix WebGL inside WebViews.

BUG: 448299

Edited by David Edmundson

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