[josm-dev] Extending Undo

[Sebastian Klein]

Upliner wrote:
> By the way, what do you think about making merge layers 
> operation undonable? I think I can implement it, there is some 
> groundwork for in reverter and fuzzer(ext_tools) plugins.

Cool. I see 2 paths here: First would be to have an undo stack for each 
data layer. Normally there is no reason you have to first undo all later 
operations on layer b before you can undo things on layer a. (Although I 
never had that problem.)

Second, make higher level layer operations undoable. (Only thing that 
should be excluded is toggle of active layer and visibility.) Undo of 
merge layer would probably the most useful extension here.

The first would be similar to a text editor where you can undo for each 
document and second would be like photoshop or gimp, where layers 
interact more closely.

Maybe both is compatible? E.g. a checkbox in command stack to show only 
the operations on the current data layer.


Sebastian