Images sometimes larger than the width of the page

[NotAFile]

Description

When receiving images, they are sometimes wider than the message section, causing weird scrolling

Steps to reproduce

• Send e.g. a screenshot
• view in riot-web on small-ish resolution

I would expect images to have a max width that fits within the message section

Log: not sent

Version information

• Platform: web

For the web app:

• Browser: Firefox nighly
• OS: Fedora 27?
• URL: riot.im/develop

[aaronraimist]

Yes I can confirm this. The weird thing is when I scroll back to old images, sometimes they display normally and sometimes they display way too large which seems to cause huge performance issues.

Firefox on Mac

[lampholder]

I think this is a dup of #6492