buffer: Ignore already invalidated buffers in Shared()#4133
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`CloseOpenBuffers()` iterates over every open buffer and invalidates them, while they are kept in the list. A further de-reference of such a buffer leads to a nil access.
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CloseOpenBuffers()iterates over every open buffer and invalidates them,while they are kept in the list.
A further de-reference of such a buffer leads to a nil access.
Fixes #4131