Hein-Pieter van Braam 2d98b40d47 Fix nested Vectors ...

When a Vector of Vectors gets resized the 'this' pointer of the Vectors
change. This means that the VectorWriteProxy _parent references get
invalidated. Thanks a lot to @ibrahn for finding the root cause of this.

To fix this we now create a pointer to CowData in Vector (which won't
change when the vectors move) and pass that to the write proxy also.

This fixes #20475

2018-07-29 17:03:35 +02:00

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