I wish to shrink the automatically inserted blank space at either end
of the x axis of my area plot, so that the colorful graphic in the
center takes up more of the available space. When I use the
scale_x_discrete(limits...) command to expand the displayed area, the
graphic shrinks away from the x-axis ticks so that there is still the
same amount of blank space at the edges.

An example:

df1

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