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Draft: Fix picking bug

Closed Martin Heistermann requested to merge fix-vertex-picking-bug into master

On some GL implementations (mesa software rendering, some AMD cards on Linux), picking would stop working when switching between pick targets.

The previous logic only updates a buffer when deemed necessary, however in any case it is first invalidated via glBufferData.

I suppose nvidia graphics, where this worked, did not clear the buffer and with some luck we got an unchanged buffer.

Fix: only use glBufferData if we actually need to change the buffer.

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