Progress Report

Test

Reworked internal representation of layers and processed layers to enable "Makie-independent testing" in #312, #313, and #316.
Added tests for the following analyses (in #319):
- density (1d and 2d),
- expectation (1d and 2d),
- frequency (1d and 2d),
- histogram (1d and 2d),
- weighted histogram (1d and 2d),
- linear regression,
- weighted linear regression,
- smooth regression.
Added tests for categorical scales (in #338).
Simplified and tested logic for facet layout (in #336):
- simplified faceting code (removed around 150 lines of code),
- tested processing of linkxaxes, linkyaxes, hidexdecorations, hideydecorations keywords,
- avoid silently ignoring misspelled attributes in facet,
- tested correct computation and placement of facet labels and spanned guide labels,
- tested correct linking behavior in facet wrap and grid, also in the presence of missing subplots,
- tested correct decoration hiding behavior in facet wrap and grid, also in the presence of missing subplots,
- fixed incorrect decoration hiding behavior in facet grid with missing subplot,
- fixed minor grid bug (issue #325).
TODO: finalize and test wide and pregrouped APIs (see #345)
TODO: test logic from ProcessedLayer to plot
TODO: test legend construction
TODO: unit tests for grouping machinery (esp. _groupreduce)
TODO: optimize and test plotting for geometrical objects (GeoInterface)

Improved performance by blocking MakieLayout updates while building the figure. Done as part of #316.

TODO: support pagination of large facet plots.

At the moment, aggressive categorical conversion can interfere with custom recipes, especially if they rely on custom types.

TODO: discuss possible strategies to address this, see comment.

TODO: handle recipes that modify the axis (e.g., hlines!).

TODO: handle recipes that require multiple axes (e.g. corrplot)?