center-align confusion matrix title

[sisp]

I've fixed the alignment of the confusion matrix title to be centered. Before, it was left-aligned which wasn't consistent with other plots – and IMO doesn't look nice.

Before	After

[dberenbaum]

Thanks @sisp! What do you think of adding the same to all the plots so we ensure it stays consistent regardless of vega-lite updates?

[sisp]

@dberenbaum We could probably do that. Do you happen to have a demo of all Vega templates to check that "anchor": "middle" renders correctly for all of them?

[dberenbaum]

I think the closest we have is https://github.com/iterative/vscode-dvc-demo/blob/main/dvc.yaml. It should be easy to adjust the templates there to check the others (for example, bar_horizontal -> bar_horizontal_sorted).

[sisp]

I've added the anchor: middle setting to all Vega-Lite plot titles. The demo plots except confusion matrix are unchanged. See the attached reports before and after the change:

• before.zip
• after.zip

[dberenbaum]

Thanks @sisp!