Horizontally scale images to text viewport

[muety]

When including large images, they overflow they page's boundaries, like this:

Rather, I'd like to have them scaled down, like this:

All required to accomplish that should be setting max-width: 100% to the img element.

[korelstar]

Thanks for your bug report! I can reproduce the issue with the current release 4.3.1. However, the next release 4.4.0 will have a new imageproxy for showing images (see #785). There, this issue does not happen. The release will take some time, but I'll close this issue for now, since there is nothing to fix anymore.