Works for me on W7 32 bits with GCC 7.2.0 and wxWidgets 3.1.0. Before the patch it lost focus forever just by clicking on tre drop down button.
I put the call to Skip() at the end of the function, as it is usually done.
NOTE: I find weird the behaviour of the combobox, it stores everything I write; if I search for WEIRD it will show W, WE, WEI, WEIR and WEIRD when dropped down.