Blog post with large image needs side scroll / horizontal scroll

[kiratskitizing]

A large image in a blog post is cropped when displayed in a small screen with no horizontal scrollbar to be used to see the full image.

Steps to replicate:

1. Create a course.
2. Turn editing on.
3. Add an OU blog and save it.
4. Go to the OU blog activity and click the "New blog post" button.
5. Using the editor, add an image.
   a. Tiny MCE

• Add an image with size/resolution at 2935x2070 in the message and save it.
  Result: Try to use a screen with smaller resolution, say 1280 X 1024. You sill see that the image is cropped. There is no horizontal scroll bar to view the full image
  Example HTML generated
  <img src="http://localhost/vanilla/pluginfile.php/91/mod_oublog/message/3/large_image.jpg" alt="" width="1200" height="1200">

b. Atto

• Add an image with size/resolution at 2935x2070 in the message and make sure "Auto size" is *not ticked.
  Result: Try to use a screen with smaller resolution, say 1280 X 1024. You sill see that the image is cropped. There is no horizontal scroll bar to view the full image.
  Example HTML generated
  <img src="http://localhost/vanilla/pluginfile.php/91/mod_oublog/message/4/large_image.jpg" alt="" class="atto_image_button_text-bottom" width="1200" height="1200">

I would think that a scrollbar would be useful so as to view the complete image?

Thank you.