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In rare cases, authors hack line charts to show breaks between line segments. They do so by using the same indicator multiple times. One side effect is that Grapher then shows a line legend label for each of these lines.
This PR makes this a bit better by de-duplicating line legend labels. I can't think of a use case where we'd want to show identical line labels.
Link: https://ourworldindata.org/explorers/poverty-explorer?facet=none&country=BOL~DEU~ALB&Indicator=Share+in+poverty&Poverty+line=%242.15+per+day%3A+International+Poverty+Line&Household+survey+data+type=Show+data+from+both+income+and+consumption+surveys&Show+breaks+between+less+comparable+surveys=true
This is part 1 of 2 in a stack made with GitButler: