Large Image Breaking Layout

[Amandaraoul]

Describe the bug
In the theme 2017, I inserted a large image into a post. The image overran the right sidebar. This is admittedly user error, since I chose too large an image for the space allowed, but still, I was surprised at the result.
To Reproduce
Steps to reproduce the behavior:

1. Insert a large image
2. Choose 100% in the image options on the right.
3. The image looks okay in the image editor.
4. When you look at the post on the front end, the image runs off the right side of the screen.

Expected behavior
I expected the image to fill the space, but not more, or perhaps an error message?
Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: iOSX version 10.11.6
• Browser chrome
• Version 68.0.3440.106

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context

• Please add the version of Gutenberg you are using in the description.
  Gutenberg Version 3.6.2

[skinnerace]

hmm

[ZebulanStanphill]

@Amandaraoul @skinnerace I think the recently-merged #7721 fixes this issue, so your problem should be fixed when the next feature update to the Gutenberg plugin (3.7) is released.

[ZebulanStanphill]

I could be wrong, though. What theme are you using?

[ZebulanStanphill]

Also, what web browser are you using?

[aduth]

Repeating these testing instructions in a site with the Twentyseventeen them me, using an image originally sized at 5760x3840, set to 100% size, there does not appear to be an overflow of the image on the front-end in Chrome:

This should have been fixed by #8399.