Not sure if this is a new bug introduced in 5.0.20, but when I add an image in a post and set its alignment to center or right, it stays left-aligned. The editor is adding text-align: center to the <p> tag, but the inserted image receives display: block in .ipsRichText__align--block class. Because the image is block-level, the parent's text-align: center has no effect. I overwrote it by adding .ipsRichText__align--block { display:inline-block !important; } and it restored the expected behavior. I tried removing all custom CSS and third-party applications, and this was still an issue, so I figured I'd share it here just in case! 😄 Thanks for all that you guys do!
