#2 Big problem with dirty propagation

[Dan Bethell]

For some reason dirty attributes at the top of graphs
are not propagating down the tree. For instance in the
following example the scale node (sc) is not detecting
the filein.filename attribute becoming dirty.

--8<---

-- add some nodes
filein = compost:add( "file:in" )
sc = compost:add( "transform:resize" )
sc.scale.value = Vector( 0.5, 0.5 ) -- half scale image
sc.filter.value = "cubic" -- cubic filtering
fileout = compost:add( "file:out" )

-- connect them up
compost:connect( filein.output, sc.input )
compost:connect( sc.output, fileout.input )

-- do some work
for n=1, table.getn( files ) do
filename = files[n] -- a table of filenames
print( "Processing "..filename )
filein.filename.value = filename
fileout.filename.value = "scaled/"..filename
fileout:work()
end