Editor, Media: Stuck scrolling and scroll bleed in gallery preview

In the screenshot below, I can’t scroll the image grid. This happens to me with regularity and often results in falling back to wp-admin. A workaround is to switch the Layout to Individual Images. That’s the only layout that will scroll. I tried doing this for awhile, but a few times of cleaning up after accidentally inserting 20 individual images dissuaded me from developing the workaround into habit.

Screen Shot 2016-02-10 at 4.33.21 PM.png

The image grid in Preview does not scroll, but the window behind the modal does.

This screencast demonstrates stuck scrolling in Preview and scroll bleed to the window beneath the modal.

Core WordPress and Calypso have a sordid history of scroll bleed on iOS. Scroll bleed is a common problem. Previously:

Core fixed many of these awhile ago, although bleed has crept back in.

That was iOS. Now we’re seeing scroll bleed on the desktop as well. I’m not a fan of the effect. Between cursor bleed and scroll bleed, many modern web apps feel like warring layers squabbling over focus and the almighty Z.

#3389-gh-wp-calypso, #chrome, #cursor-bleed, #desktop, #editor, #macos, #media, #media-modal, #scroll-bleed