We have a nice plot preview for "normal" plugins. However, another useful feature is adding parts to an existing plot. E.g. the "grid" plugin in x11 context, but also we might add support for adding legends, labels, etc. It would be cool, if these supported a preview, too. For this to work, we'd have to:
1. save the existing plot
2. open a preview device associated with the saved plot
3. Inside .rk.startPreviewDevice() the plot would be initialized / reset to the saved plot
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