User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b6pre) Gecko/20100913 Firefox/4.0b6pre Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b6pre) Gecko/20100913 Firefox/4.0b6pre The arrow should only be hidden if the border-radius is set to the right Reproducible: Always Steps to Reproduce: 1. Set border-radius to 3px 0 0 3px to a select element (not multiple) Actual Results: The arrow of the select element is not displayed Expected Results: The arrow of the select element is displayed

Darren, I can't reproduce this (on Mac, with native theming both on and off), but this might well be OS-specific due to native theme rendering. Can you please attach an HTML file that shows the problem for you?

The select is set with a border-radius and a border-color.

Martijn, Ria, do you see this on Windows? If so, can you or Darren narrow down when the problem appeared, perhaps.

I see this on Windows 7 too (latest trunk). I dont have any time to look for a regression window, but it works in beta 5 though.

I can't reproduce with the 'dirty testcase'. This is the screenshot of what I'm seeing. This is tested with today's (20100914) trunk build. I also tested with the old win95, I can't reproduce it in there, either.

Martijn, is the "can't reproduce" on Windows 7?

Yes.

Build ID: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b7pre) Gecko/20100914 Firefox/4.0b7pre I enabled HA and the arrow is now visible. Turning off HA and it goes away.

Uh.... really? A correctness bug _fixed_ by hardware acceleration being on? ;)

Here is a screenshot showing the arrow with hardware acceleration on a 7800GT graphic card.

Regression window : http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=8e0fce7d5b49&tochange=79d0beec27b5

That's the range in which we switched from -moz-border-radius to border-radius as the property name. If you use -moz-border-radius, does the problem appear in older builds.

Probably bug 595842, bug 596205 (this bug), and bug 596271 are related.