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Improved release notes #3324

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merged 3 commits into from
May 11, 2019
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Improved release notes #3324

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306650c
Add paragraph about visual changes. Fixes #3304.
clauswilke May 10, 2019
5e4c3fa
add breaking changes section
clauswilke May 11, 2019
e77e4b9
provided explicit examples of where things go wrong.
clauswilke May 11, 2019
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Expand Up @@ -7,6 +7,21 @@ extension developers if they have relied on internals that have been changed.
This release also sees the addition of Hiroaki Yutani (@yutannihilation) to the
core developer team.

## Breaking changes

* Two patches (#2996 and #3050) fixed minor rendering problems. In most cases,
the visual changes are so subtle that they are difficult to see with the naked
eye. However, these changes are detected by the vdiffr package, and therefore
any package developers who use vdiffr to test for visual correctness of ggplot2
plots will have to regenerate all reference images.

* In some cases, ggplot2 now produces a warning or an error for code that previously
produced plot output. In all these cases, the previous plot output was accidental,
and the plotting code uses the ggplot2 API in a way that would lead to undefined
behavior. Examples include a missing `group` aesthetic in `geom_boxplot()` (#3316),
annotations across multiple facets (#3305), and not using aesthetic mappings when
drawing ribbons with `geom_ribbon()` (#3318).

## New features

* This release includes a range of internal changes that speeds up plot
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