[Qgis-developer] Deactivate raster icon generation by default

[Régis Haubourg]

+1 too. 
just a note on this. Using a 20 tiles vrt with ecw files, for a total size
of 120 Go, on 1.8 , raster icon generation takes ages. On 1.9, it was almost
instantaneous (with raster icon ON).
Since only big tiled vrt seem to slow down, and since having icon remains
pretty helpful in legend, I just created pyramids overview, only for smaller
pyramids (16 , 32). It solves the raster icon generation issue since only
pyramids are used to generate icons. 
Hope that can help someone who needs to keep raster icon generation On. 
Régis



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