[bug 3255] comboboxex fix + tests

[Michael Stefaniuc]

Hello Jason,

are you sure you sent the patch? Looks to me more like the output of 
"cvs update" ;)

bye
	michael

Ann & Jason Edmeades wrote:
> The bug itself was an off by one calculation due to zero based indexes, but
> I also saw the same problem existed in other functions and so wrote some
> small tests for them. 
> 
> Changelog
> 
> Fix some off by one calculations in the comboboxex functions, and handle an
> out of range positive index the same as windows + unit test case



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