[GRASS5] Region lock

[Radim Blazek]

Glynn Clements wrote:
> Radim Blazek wrote:
> 
> 
>>Does it make sense to add region lock?
> 
> 
> AFAICT, no.
> 
> Is there a specific scenario where you think that a lock would be
> useful?

Always when user run a raster module via GUI or on background and then 
he continues to change the region g.region/d.zoom. It is quite common, 
if user has to wait until the background job finishes he usually query 
maps in monitor using d.zoom/d.pan. This is especially danger for scripts.
No errors are reported, but results are wrong (e.g. r.what in loop).

I cannot say how danger it is for single modules. For scripts it IS 
problem. We could add g.regionlock and encourage users to start scripts
with this module.

But it can be done also later, I have moved it to TODO > 6.0.

Radim