Font size not applied properly in composite diagram

[cchalmers]

Applying fontSize to a composite diagram doesn't render properly:

rightSize = square 3 <> text "hi" # fontSizeL 2
wrongSize = (square 3 <> text "hi") # fontSizeL 2

Inspecting the SVG output shows the correct size is applied in an outer group but the Recommended size is used in an inner group and that's what gets shown. I suspect this is from the recent changes to Measure. It doesn't happen in the rasterific or pgf backends.

[cchalmers]

On a related issue, certain attributes are being output several times even though they're identical. Here's the gradient example from the tutorial: http://lpaste.net/129623. Each gradient is defined an applied 3 times even though they're identical.

I think if we accumulate the style in the state and only apply the style when it's used, like the other backends, both these issues should be fixed.

[jeffreyrosenbluth]

The reason that the SVG backend doesn't accumulate styles using the state stack is probably a bit of a historical accident. When i switched to an RTree instead of a list of primitives one of the first things i did was to port the svg backend. Hence the RTree based backend probably inherited these redundancies from the list based backend. This was before byorgey designed the state stack to convert the cairo backend. It's probably worth looking into @cchalmers suggestion.