fix: obtain expected quantity values from manual scale #5363
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This pull request fixes a bug in the code and adds corresponding unit tests.
When we use
manual_scale
to create adiscrete_scale
, thepalette
should be a function that can return the specified number ofvalues
.Here is the parameter description quoted from
scale-.R
:The original
manual_scale
method simply returns all thevalues
, whereas the modified method will return the first nvalues
specified.