Consistent decimals in gradient legend

[grantmcdermott]

The current behaviour for gradient legends is a bit annoying because it can lead to inconsistent use of decimals in the swatch labels. For example, the 4, 3.5, etc. here:

plt(Sepal.Width ~ Petal.Width | Sepal.Width, iris, pch = 19, palette = "grays")

A simple solution is to tweak

tinyplot/R/draw_legend.R

Line 532 in 4a272ce

lgnd_labs[labs_idx] = paste0(" ", lgnd_labs[labs_idx])

by wrapping with format:

lgnd_labs[labs_idx] = paste0(" ", format(lgnd_labs[labs_idx]))

Which leads to the nicer:

An easy fix, but will break a lot of tests, so maybe hold off until some of the bigger PRs are merged.