KMenu title is navigable with the keyboard

[Thomas Lübking]

Commit monkey or not - patch attached, applies to Qt4.6 beta (before the ABI 
break...)

You can have a title separator as long as there's a succeeding NON separator 
action

- Title -
Entry
Entry
   ----
Entry
...

but NOT

- Title -
   ----
Entry
Entry
...

or

   ----
Entry
Entry
...

and NOT

...
Entry
Entry
- Title -

or

...
Entry
Entry
   ----
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