You can clone with
Correct margin in 1.0.1: http://jsfiddle.net/ha8CC/
Incorrect margin in master/1.1rc1: http://jsfiddle.net/ha8CC/1/
As I can see the problem is that ".ui-select .ui-btn" margin 0; overrides correct margin: 0.5em 5px; from simple ".ui-btn".
So when disabling magin 0 in firebug - everything looks fine.
I have this problem in Android 2.3.5 browser, Firefox 10.0.2 and 11beta. In IE8 it is a little bit better.
Looks like it's fixed in master. Closing
oh no, I'm very sorry... it's not
Just reference #4098 because I will look into consistency of buttons/form elements in general while working on a solution for that issue.
ok. should I close this issue?
No, don't close until it is actually fixed.
Just to be up to date: same problem with 1.1.0http://jsfiddle.net/ha8CC/21/
Fixes #3684 - Removed explicit margin 0 rule for selectmenu buttons.