Bug 257075 [keyboard] User can't select mails which are not next to.

r=aaronleventhal sr=neil

toolkit/content/widgets/tree.xml

@@ -484,7 +484,7 @@
       <handler event="keypress">
         <![CDATA[
          var c = this.currentIndex;
-         if (event.keyCode == ' '.charCodeAt(0)) {
+         if (event.charCode == ' '.charCodeAt(0)) {
            if (!this.view.selection.isSelected(c))
              this.view.selection.toggleSelect(c);
          }

xpfe/global/resources/content/bindings/tree.xml

@@ -477,7 +477,7 @@
       <handler event="keypress">
         <![CDATA[
          var c = this.currentIndex;
-         if (event.keyCode == ' '.charCodeAt(0)) {
+         if (event.charCode == ' '.charCodeAt(0)) {
            if (!this.view.selection.isSelected(c))
              this.view.selection.toggleSelect(c);
          }