Add option for draw.gam() to return a list of plots instead of cowplot::plot_grid() output about gratia HOT 3 OPEN

Would it be better to have draw.gam() return inconsistently along the lines you suggest, or have a separate function assemble() which would produce (the equivalent of) g, and leave draw.gam() as it is now, but use assemble() internally to create g?

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Honestly, I'm unsure. A separate function maintains better {function name} -> {actual effect} mapping, but it's more memory load for users. Though, since you don't have an intro vignette yet, you have more flexibility to explicitly document the suggested workflow.

Ideally, we should just extend the + operator to work on the output of plot_grid... but that is a job for Claus Wilke, I think!

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OK, thanks @ha0ye. I'll make an executive decision then 😄

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