replace space bar with arrow key thread handling

and switch spacebar to select messages

program/js/list.js

@@ -1124,10 +1124,13 @@ key_press: function(e)
       // Stop propagation so that the browser doesn't scroll
       rcube_event.cancel(e);
       return this.use_arrow_key(keyCode, mod_key);
-    case 61:
-    case 107: // Plus sign on a numeric keypad (fc11 + firefox 3.5.2)
-    case 109:
     case 32:
+      rcube_event.cancel(e);
+      return this.select_row(this.last_selected, mod_key, true);
+    case 37: // Left arrow key
+    case 39: // Right arrow key
+    case 107: // Plus sign on a numeric keypad
+    case 109: // Minus sign on a numeric keypad      
       // Stop propagation
       rcube_event.cancel(e);
       var ret = this.use_plusminus_key(keyCode, mod_key);
@@ -1196,11 +1199,8 @@ use_plusminus_key: function(keyCode, mod_key)
   if (!selected_row || !selected_row.has_children)
     return;
 
-  if (keyCode == 32)
-    keyCode = selected_row.expanded ? 109 : 61;
-
   // expand
-  if (keyCode == 61 || keyCode == 107) {
+  if (keyCode == 39 || keyCode == 107) {
     if (selected_row.expanded)
       return;