[Therion] Include additional symbols in the legend

[Martin Sluka]

This is the trick! 

Thanks!

Martin

> 22. 10. 2020 v 13:23, Xavier Robert <xavier.robert at univ-grenoble-alpes.fr>:
> 
> Hi,
> 
> Or a possibility : In one of your th2 for the plan, draw the missing symbol(s) from your plan that appears in your extended elevation, but draw them outside of the cave’s walls, and with the option -clip on. 
> I have not tried, but they should then appear in the legend of your plan-pdf, but not in the plan view.
> 
> Cheers,
> 
> Xavier
> 
>> Le 22 oct. 2020 à 13:00, Tarquin Wilton-Jones via Therion <therion at speleo.sk> a écrit :
>> 
>> On 22/10/2020 11:44, Martin Sluka via Therion wrote:
>>> Sorry, invisible symbols are not included in legend.
>> 
>> you might be able to include a custom symbol that looks the same, which
>> chooses to draw nothing when not in the legend. that's quite a hack though.
>> 
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