Add support for ggalt::geom_dumbbell. #1782
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This PR adds support for
ggalt::geom_dumbbell
and closes #1454 .The implementation follows
ggalt::GeomDumbbell
.Tooltips only show up if hovering over the points and differ for the left and right point. To this end I added a util function
make_hovertext
which overwrites the hovertext set bylayers2traces
.I also added some tests and tried to add a visual test (which however failed when running the test while vdiffr::manage_cases showed me a successful doppelganger). Therefore the visual test is commented out in the test.