Fix for jQueryUI inconsistent button styling (#7996)

diff --git a/themes/base/jquery.ui.button.css b/themes/base/jquery.ui.button.css
index e0f91a8..ee382f1 100644
--- a/themes/base/jquery.ui.button.css
+++ b/themes/base/jquery.ui.button.css
@@ -17,6 +17,7 @@
    text-align: center;
    zoom: 1;
    overflow: visible; /* removes extra width in IE */
+   line-height: normal;
 }
 .ui-button,
 .ui-button:link,
@@ -43,7 +44,7 @@ button.ui-button-icons-only {
 /* button text element */
 .ui-button .ui-button-text {
    display: block;
-   line-height: 1.4;
+   line-height: normal;
 }
 .ui-button-text-only .ui-button-text {
    padding: .4em 1em;
@@ -105,7 +106,8 @@ input.ui-button {
 }

 /* workarounds */
-/* reset extra padding in Firefox */
+/* reset extra padding in Firefox, see h5bp.com/l */
+input.ui-button::-moz-focus-inner,
 button.ui-button::-moz-focus-inner {
    border: 0;
    padding: 0;