Remove unused cylinders from dropdown

[Berthold Stoeger]

On Freitag, 11. Dezember 2020 16:44:18 CET Berthold Stoeger via subsurface 
wrote:
> On Freitag, 11. Dezember 2020 15:08:47 CET Adolph Weidanz via subsurface
> 
> wrote:
> > Is there a way to remove the unused cylinders from the dropdown? There
> > are a lot of them there and I will never use most of them and these
> > old eyes have a time trying to discern which is which.
> 
> Sadly, as far as I can tell, the list is generated statically on application
> startup. I reckon that this should be optional. I'll try to come up with
> something over the weekend. Please remind me, should I forget.

I quickly cobbled something together:
https://github.com/subsurface/subsurface/pull/3101
Beware: This is only lightly tested.

I'm not sure if you know how to build from source or which platform you're 
using.

Berthold