A regression introduced by a patch in bug 960517. See attached SWF file for video of this happening. I think there is a border-color of -moz-use-text-color that is getting applied at the beginning of the transition, but I haven't been able to find the exact spot.

The 2px border is also a bug. I have also found another bug related to the bookmarks menu button : When you "drag" the bookmarks menu button, the separator will be missing.

This was surprisingly difficult to debug, and I don't 100% understand it yet. Something about using -moz-border-end and the border-right-color-ltr-source being set to physical was causing this to happen. I really can't give a thorough explanation, I'm afraid. :/ What I am able to give, is a patch that fixes it.

Comment on attachment 8394406 [details] [diff] [review] Patch v1 *shrug*

Does replacing -moz-border-end: none; with -moz-border-end-style: none; help? If not, maybe you're running into bug 591600. Does it help if you replace 'transparent' with e.g. 'hsla(210,54%,20%,.0)' here: <http://hg.mozilla.org/mozilla-central/annotate/cf485c48b52f/browser/themes/windows/browser.css#l579>?

(In reply to Dão Gottwald [:dao] (on vacation from March 21 to 28) from comment #5) > If not, maybe you're running into bug 591600. Does it help if you replace > 'transparent' with e.g. 'hsla(210,54%,20%,.0)' here: > <http://hg.mozilla.org/mozilla-central/annotate/cf485c48b52f/browser/themes/ > windows/browser.css#l579>? Err, bug 591600 is about gradients, but may still be remotely related if the problem is how 'transparent' is handled.

Mike, did you try applying my patch in bug 984976 first? I mentioned in that bug that I didn't see this flickr with the style changes applied there.

(FWIW, when I reviewed bug 984976, I also didn't see the issue anymore)

I like freebies. Testing patch for bug 984976 now.

Woo! Bug 984976 takes care of it! We're done here folks. Sayonara!

Comment on attachment 8394406 [details] [diff] [review] Patch v1 Review of attachment 8394406 [details] [diff] [review]: ----------------------------------------------------------------- r=me with the following change. ::: browser/themes/windows/browser.css @@ +638,5 @@ > + * Apparently, for -moz-border-end, even though there's no border here, we still > + * need to have a colour assigned to it for when we're hovering the menu button, > + * since we transition on the border colour. > + */ > + -moz-border-end: none hsla(210,54%,20%,.2); Please expand this to: -moz-border-end-style: none; -moz-border-end-color: hsla(210,54%,20%,.2);

Gah - sorry, should have removed the r? on that patch when I WORKSFORME'd this.