Cleans up IE7 inline margins for buttons and adds them for sprites, also fixes...

Cleans up IE7 inline margins for buttons and adds them for sprites, also fixes button padding for large/small sizes

less/buttons.less

@@ -67,12 +67,6 @@
   // Button Base
   display: inline-block;
   padding: 4px 10px 4px;
-  // IE7 likes to collapse the whitespace before the button, so bring it back...
-  *margin-left: 4px;
-  &:first-child {
-    // ...but not before the first button
-    *margin-left: 0;
-  }
   font-size: @baseFontSize;
   line-height: @baseLineHeight;
   color: @grayDark;
@@ -85,6 +79,8 @@
   .box-shadow(@shadow);
   cursor: pointer;
 
+  .ie7-restore-left-whitespace;
+
   &:hover {
     color: @grayDark;
     text-decoration: none;
@@ -129,7 +125,7 @@
 
   // Button Sizes
   &.large {
-    padding: 9px 14px 9px;
+    padding: 9px 14px;
     font-size: @baseFontSize + 2px;
     line-height: normal;
     .border-radius(5px);
@@ -138,7 +134,7 @@
     margin-top: 1px;
   }
   &.small {
-    padding: 5px 9px 5px;
+    padding: 5px 9px;
     font-size: @baseFontSize - 2px;
     line-height: @baseLineHeight - 2px;
   }
@@ -150,10 +146,20 @@
 // Help Firefox not be a jerk about adding extra padding to buttons
 button.btn,
 input[type=submit].btn {
-  // IE7 has some default padding on button controls
-  *padding: 2px 10px;
   &::-moz-focus-inner {
   	padding: 0;
   	border: 0;
   }
+
+  // IE7 has some default padding on button controls
+  *padding-top: 2px;
+  *padding-bottom: 2px;
+  &.large {
+    *padding-top: 7px;
+    *padding-bottom: 7px;
+  }
+  &.small {
+    *padding-top: 3px;
+    *padding-bottom: 3px;
+  }
 }

less/mixins.less

@@ -36,6 +36,28 @@
   *zoom: 1;
 }
 
+// IE7 likes to collapse whitespace on either side of the inline-block elements.
+// Ems because we're attempting to match the width of a space character. Left
+// version is for form buttons, which typically come after other elements, and
+// right version is for icons, which come before. Applying both is ok, but it will
+// mean that space between those elements will be .6em (~2 space characters) in IE7,
+// instead of the 1 space in other browsers.
+.ie7-restore-left-whitespace() {
+  *margin-left: .3em;
+
+  &:first-child {
+    *margin-left: 0;
+  }
+}
+
+.ie7-restore-right-whitespace() {
+  *margin-right: .3em;
+
+  &:last-child {
+    *margin-left: 0;
+  }
+}
+
 // Sizing shortcuts
 // -------------------------
 .size(@height: 5px, @width: 5px) {

less/sprites.less

@@ -19,6 +19,8 @@
   vertical-align: text-top;
   width: 14px;
   height: 14px;
+
+  .ie7-restore-right-whitespace;
 }
 .icon.white {
   background-image: url(../img/glyphicons-halflings-sprite-white.png);