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**Added:**
* Visualization for an individual flow component.
* Expose `inner` half edges, i.e., those that are visually glued.
* Allow forcing half edges to be visually glued, see `examples/glueings.ipynb`.
* Example notebook for visualization of cylinders in orthogonal directions.
**Fixed:**
* Fix shading of flow components. Sometimes bits of a flow component that was completely inside a face had been missing.
* Do not show inner structure of minimal components but only the boundary of such components.