BUG: Deepcopy the plot saved as last_plot#1069
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plot_context stored the in-progress plot via a shallow copy, so the
object returned by last_plot() shared mutable nested state (e.g. the
theme) with the plot being built. Building mutated that shared state,
leaving last_plot() referencing a half-built plot.
As a result, code like
last_plot() + labs(subtitle="ab")
failed to left-align the title, because the title's alignment had
already been altered in the shared state during the previous build.
Use deepcopy so last_plot() is an independent, pristine snapshot.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #1069 +/- ##
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Coverage 87.10% 87.10%
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Files 208 208
Lines 14321 14321
Branches 1788 1788
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Hits 12474 12474
Misses 1283 1283
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plot_contextstored the in-progress plot via a shallow copy, so the object returned bylast_plot()shared mutable nested state (e.g. the theme) with the plot being built. Building mutated that shared state, leavinglast_plot()referencing a half-built plot.As a result, code like
failed to left-align the title, because the title's alignment had already been altered in the shared state during the previous build.
Use
deepcopysolast_plot()is an independent, pristine snapshot.