Previewing posts causes saves and updates to freeze in Safari 5.1

[chrisrudzki]

Previewing posts causes subsequent saves and updates to freeze, resulting in an endless spinning wheel, in Safari 5.1. The issue arises under different conditions, depending on the version of Mac OS X that Safari 5.1 is running on.

Steps to Reproduce:

Safari 5.1 on Mac OS X 10.6.8

1. Edit or create a draft/post, and then click Save Draft or Update
2. Preview draft/post
3. Close preview window or don’t close preview window. Doesn’t matter.
4. Clicking on Save Draft or Update results in endless spinning wheel

Safari 5.1 on Mac OS X 10.7

1. Edit or create a draft, and then click Save Draft
2. Preview draft
3. Don’t close preview window
4. Clicking on Save Draft or Publish results in endless spinning wheel

Issue reports:
​http://en.forums.wordpress.com/topic/freezing-when-i-try-to-save-a-draft
​http://en.forums.wordpress.com/topic/freezing-when-i-try-to-save-a-draft-1
​http://en.forums.wordpress.com/topic/how-do-i-fix-repeated-freezing-and-other-new-problems

There are also reports of the same issue occurring with other browsers, such as Chrome: ​http://wordpress.org/support/topic/freezing-when-saving-a-draft
​http://en.forums.wordpress.com/topic/freezes-when-saving-draft

However, I'm not able to reproduce this in Firefox 5.0.1 or Chrome 13.0.782.107 under OS X 10.6.8 or 10.7

Possibly a Webkit bug and duplicate of #12778

Reproduced on Safari 5.0.5 and 5.1 for Windows as well.

Attached a workaround based on the one from ​https://bugs.webkit.org/show_bug.cgi?id=28633#c13.

This is pretty bad.

The WebKit bug was fixed on 2011-09-15, not sure how long until it gets in Chrome (Mac) and Safari. Current Mac Safari (5.1.1) still fails, so we'd need to patch it.

In [19299]:

Workaround for WebKit bug when previewing posts, props SergeyBiryukov, fixes #18341