Keyboard Navigation Improvements

ALT-L will now jump from the filter to the first item in the list,
saving a few keys.

SHIFT-TAB in the list of checkboxes will bring focus to the last item in
the header, usually the close button so keyboard navigation can
continue. This is instead of closing the menu.

Got rid of that 'ui-front' addition. It should never have been
committed.

Author: mlh758

src/jquery.multiselect.filter.js

@@ -62,7 +62,7 @@
           type: "search"
         }).css({
           width: (/\d/.test(opts.width) ? opts.width + 'px' : null)
-        }).addClass("ui-front").bind({
+        }).bind({
         keydown: function(e) {
           // prevent the enter key from submitting the form / closing the widget
           if(e.which === 13) {
@@ -81,6 +81,9 @@
               case 85:
                 elem.multiselect('instance').uncheckAll();
                 break;
+              case 76:
+                elem.multiselect('instance').labels.first().trigger("mouseenter");
+                break;
             }
           }
         },

src/jquery.multiselect.js

@@ -373,6 +373,13 @@
         e.preventDefault();
         switch(e.which) {
           case 9: // tab
+            if(e.shiftKey) {
+              self.menu.find(".ui-state-hover").removeClass("ui-state-hover");
+              self.header.find("li").last().find("a").focus();
+            } else {
+              self.close();
+            }
+            break;
           case 27: // esc
             self.close();
             break;
@@ -383,6 +390,7 @@
             self._traverse(e.which, this);
             break;
           case 13: // enter
+          case 32:
             $(this).find('input')[0].click();
             break;
           case 65: