problem with texmanager in matplotlib 0.87


I have tried matplotlib 0.87 and bumped on a problem with the dpi settings. I have set "text.usetex=True" and I use the Agg backend. When I write a figure to a png file at different resolutions, the size of the text in pixels remains the same, while it should be the size relative to the image size that is invariant.

I'll send a patch in the near future, unless someone else is already working on this.