[Qgis-developer] Dissolve in a grid? (fTools)

[Eliott coyac]

Hey,

This is the other change I made to the fTools plugin. When dealing with 
lots of shapes to dissolve (especially from a buffer), I have found it 
to be very slow to dissolve it all. It's much faster to dissolve using a 
grid: specify a width for the grid spacing, and shapes in the same part 
of the grid are dissolved together.

Then you can apply manually another dissolve to the whole result layer, 
or choose a wider grid. Overall for high-density buffers the gain in 
speed is enormous. (over a week -> 1h30 in a test case)

I added it to the fTools plugin for my own purposes (added a line with a 
checkbox and a grid spacing in the ui), but should I make a pull request 
to have it included in the standard fTools - since my need may not be 
universal?

Thanks