fix image size problem in render_odg

The size of the display is not the size of the image, it should be the maximum
size of the image but in all cases, the image should keep its ratio aspect.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31524 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/ImageField.py

@@ -150,6 +150,7 @@ class ImageFieldWidget(Widget.TextWidget):
       # set the size of the image
       if display is not None:
         height, width = image_object.getSizeFromImageDisplay(display)
+        width, height = image_object._getAspectRatioSize(width, height)
         if draw_frame_node.attrib.get('{%s}width' % SVG_URI, {}) != {} and \
         draw_frame_node.attrib.get('{%s}height' % SVG_URI, {}) != {}:
           # if a size already exist from attr_dict, try to resize the image to