public boolean removeListener(@Nonnull ProblemInvalidationListener listener) {
		return listeners.remove(listener);
	}
@param listener
		Listener to remove.

@return {@code true} when listener was removed.
{@code false} when listener was not present to begin with.
recaf-ui/src/main/java/software/coley/recaf/ui/control/richtext/problem/ProblemTracking.java