Hello,
currently KTabBar emits mouseDoubleClick(int) if a tab has been double 
clicked, but if the empty space next to the tabs has been double clicked, no 
signal is emitted.

I see two possible solutions:
* emit mouseDoubleClick(-1)
* create a new signal emptySpaceDoubleClick()

The first solution is easier, at the expense of having a "magic" value.
Suggestions? Opinions? Should something be done about middle clicks too?

(Note this problem only occurs when using KTabBar without a KTabWidget, e.g. 
in Konsole)




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