PATCH for improve the panel action(bug num:177219)

[Sebastian Kügler]

On Monday 08 December 2008 13:40:37 zhangqiang wrote:
> In order to help general users.I make a patch.I don't know whether it is
> needed and suitable.That is, if the user deletes the last panel,give the
> tip "This is the last panel! Make sure you know how to add it.",that is
> unlike the usual tip "Do you really want to remove the panel ?" I do it in
> the containment, and my patch attached. Thanks very much.

Other than Aaron's comments, the codingstyle is not in accordance with what we 
usually do, tabs/spaces mix (it should always be 4 spaces), whitespace around 
parentheses.

Something to take care of in your next revision :)
-- 
sebas

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