Size change of images do not work as i should

[dikonsult]

If you drag in the corner of an image it should retain its proportions.
Drag of corner also always start with an minimized image and not from its latest size.

Regards
Dag

[zuobaoquan]

The doc editor now preserves aspect ratio with the fix in #80, but DocInsight don't save image size in xml doc. Do you need it?