I'm resizing an image in the viewer (Convert Image) to custom size with "Preserve aspect ratio". Let's say I type in a new width. I'd expect the viewer to show me the new computed height, so that I can get an idea of the new size. As it is, when I type a new width, the height shows the old value, which suggests that the resized image will be oddly shaped (the resize itself works fine, it's the display of inconsistent values that bothers me). As you type in one new dimension, the other field should be grayed out and show the other computed dimension. Both fields shouldn't be shown as editable at the same time, because it suggests that you can enter two arbitrary values and still "preserve aspect ratio", which isn't the case.