Build Identifier: http://hg.mozilla.org/mozilla-central/rev/10e019421e6b Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/16.0 Firefox/16.0a1 ID:20120621053048 When I tested Bug 767281, I noticed the position gap of the image. Steps to Reproduce: 1. Open attachment 635651 [details] Actual Results: Image moves slightly up/down or left/right Expected Results: Not move There are 2 regression. #1 Images ignores transform scale when opacity applied #2 Partially Fixed #1 regression. but Images moves slightly up and down #1 Regression window(m-c) Good: http://hg.mozilla.org/mozilla-central/rev/e1ae143cc842 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0a1) Gecko/20111026 Firefox/10.0a1 ID:20111026120007 Bad: http://hg.mozilla.org/mozilla-central/rev/16a8d2ab5240 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0a1) Gecko/20111026 Firefox/10.0a1 ID:20111026163203 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=e1ae143cc842&tochange=16a8d2ab5240 #1 Regression window(m-i) Good: http://hg.mozilla.org/integration/mozilla-inbound/rev/98013fe19dcb Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0a1) Gecko/20111025 Firefox/10.0a1 ID:20111025195747 Bad: http://hg.mozilla.org/integration/mozilla-inbound/rev/d7f3bfc7cd46 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0a1) Gecko/20111025 Firefox/10.0a1 ID:20111025203245 Pushlog: http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=98013fe19dcb&tochange=d7f3bfc7cd46 Triggered by: 8b89d7037306 Matt Woodrow — Bug 695275 - Fix conversion of ThebesLayers to ImageLayers. r=roc #2 Regression(Pertial fix) window(m-c) Bad: http://hg.mozilla.org/mozilla-central/rev/c00a9c1940c5 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120515185430 Bad(Partially fix): http://hg.mozilla.org/mozilla-central/rev/bfc259be3fa2 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120516020729 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=c00a9c1940c5&tochange=bfc259be3fa2 #2 Regression(Pertial fix) window(m-i) Bad: http://hg.mozilla.org/integration/mozilla-inbound/rev/b69d000b726a Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120514231326 Bad(Partially fix): http://hg.mozilla.org/integration/mozilla-inbound/rev/dd3c873674fc Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120515030522 Pushlog: http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=b69d000b726a&tochange=dd3c873674fc Triggered by: dd3c873674fc Matt Woodrow — bug 750334 - rotating image appears too big during transition, then snaps to correct size r=roc And bug 750334 was already uplifted to 14Beta.

Not a recent regression, and doesn't have a significant user impact. Any fix here would ride the trains given that.

To Emmanuele for a look...

the test case is an adaptation of the original in attachment 635651 [details] to try and pinpoint the failure cases. it seems that the regression appears if the <img> changing opacity is on top of another <img>; if the image is on top of <div> (of any opacity), of if both images are replaced by <div>s, the regression disappears.

cannot reproduce in Nightly 19.0a1 (2012-11-06) on my Fedora 17; I think we can chalk this one up to the DisplayList invalidation code.