Ticket #20015: dashboard_columns.1.20015

Index: wp-admin/css/wp-admin.dev.css
===================================================================
--- wp-admin/css/wp-admin.dev.css       (revision 19956)
+++ wp-admin/css/wp-admin.dev.css       (working copy)
@@ -2097,6 +2097,22 @@
        float: left;
 }
 
+.postbox-container.width-full {
+       width:100%
+}
+.postbox-container.width-half {
+       width:50%
+}
+.postbox-container.width-third {
+       width:33.33333%
+}
+.postbox-container.width-quarter {
+       width:25%
+}
+.postbox-container.hide-column {
+       display:none
+}
+
 .postbox-container .meta-box-sortables {
        min-height: 350px;
 }
Index: wp-admin/includes/dashboard.php
===================================================================
--- wp-admin/includes/dashboard.php     (revision 19956)
+++ wp-admin/includes/dashboard.php     (working copy)
@@ -200,33 +200,33 @@
        $hide2 = $hide3 = $hide4 = '';
        switch ( $screen_layout_columns ) {
                case 4:
-                       $width = 'width:25%;';
+                       $width = 'width-quarter';
                        break;
                case 3:
-                       $width = 'width:33.333333%;';
-                       $hide4 = 'display:none;';
+                       $width = 'width-third';
+                       $hide4 = 'hide-column';
                        break;
                case 2:
-                       $width = 'width:50%;';
-                       $hide3 = $hide4 = 'display:none;';
+                       $width = 'width-half';
+                       $hide3 = $hide4 = 'hide-column';
                        break;
                default:
-                       $width = 'width:100%;';
-                       $hide2 = $hide3 = $hide4 = 'display:none;';
+                       $width = 'width-full';
+                       $hide2 = $hide3 = $hide4 = 'hide-column';
        }
 ?>
 <div id="dashboard-widgets" class="metabox-holder">
 <?php
-       echo "\t<div id='postbox-container-1' class='postbox-container' style='$width'>\n";
+       echo "\t<div id='postbox-container-1' class='postbox-container $width'>\n";
        do_meta_boxes( $screen->id, 'normal', '' );
 
-       echo "\t</div><div id='postbox-container-2' class='postbox-container' style='{$hide2}$width'>\n";
+       echo "\t</div><div id='postbox-container-2' class='postbox-container $width $hide2'>\n";
        do_meta_boxes( $screen->id, 'side', '' );
 
-       echo "\t</div><div id='postbox-container-3' class='postbox-container' style='{$hide3}$width'>\n";
+       echo "\t</div><div id='postbox-container-3' class='postbox-container $width $hide3'>\n";
        do_meta_boxes( $screen->id, 'column3', '' );
 
-       echo "\t</div><div id='postbox-container-4' class='postbox-container' style='{$hide4}$width'>\n";
+       echo "\t</div><div id='postbox-container-4' class='postbox-container $width $hide4'>\n";
        do_meta_boxes( $screen->id, 'column4', '' );
 ?>
 </div></div>