[PATCH] Make Enter/Return emit executed() in KListView

[Ryan Cumming]

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Hi,

This patch makes KListView emit executed() when the enter or return key is 
pressed while an item is a selected. 

This allows KListView to be fully keyboard navigable without any extra effort 
on the application's part. Similar code has been duplicated many times across 
KDE at the application level.

- -Ryan
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