@Nonnull
	public List<Problem> getProblemsOnLine(int line) {
		synchronized (problems) {return problems.getOrDefault(line, Collections.emptyList());}
	}
@param line
		Line number of problems to get.

@return Problems on the line.
recaf-ui/src/main/java/software/coley/recaf/ui/control/richtext/problem/ProblemTracking.java