1. copy to buffer

Select objects then {ctrl+c} or {e c} to copy them to the current paste 
buffer. Note: floaters and wirenet part objects can not be copied.

The copy will automatically select the buffer tool (just like in pcb-rnd), 
and you can place copies of the current buffer.


2. cut to buffer

Same as copy, but also removes the original objects. {ctrl+x} or {e x}.


3. paste from buffer

While the buffer tool is activated, you should get a xor-draw of the 
buffer content over the sheet. A single click would copy buffer content to 
sheet at current crosshair coords. It's the same as in pcb-rnd.

{ctr+v} activates the buffer tool but doesn't do a paste, again, just like 
in pcb-rnd.


4. buffer menu: save buffer symbol or group to file

If you have a symbol or group in your buffer, you can use this feature to 
save them to a file. The resulting file is a group file, which will also 
be our symbol format (this is what we will have in our library). 

(The other save, "buffer content" doesn't yet work, that one will save the 
whole buffer, any object, not just the first group.)


5. buffer menu: load buffer symbol/group from file

This is the reverse of 4., it loads a group file you saved earlier. Same 
as pcb-rnd's file/import/subc


6. multiple buffers

We have inherited this feature from geda/pcb in pcb-rnd: there are 
multiple different paste buffers in parallel and you can pick which one 
you are using. This way you can save different temporary things in 
different paste buffers.

As far as I can tell nobody uses this feature, but it is super-cheap to 
implement, so to match pcb-rnd, sch-rnd implements this too. Buffer menu, 
buffer selection. Scratchpad may be overwritten by the code any time, but 
it is safe to use the first 4 buffers.


7. explicit buffer transformations

The first few items of the buffer menu are explicit buffer 
transformations. Put something in the buffer and you can use these to get 
the buffer rotated or mirrored. 


8. auto choose buffer/object transformation

A more common tool set for the same sort of operations is in the edit menu 
whirl and mirrors. If you have the buffer tool active, these will oeprate 
on the buffer, just like point 7 above. If you have any other tool 
activated, these will operate on the object at the crosshair.