Add a unit test checking selection updating in virtual wxListCtrl.

Verify that the selection is updated correctly after the number of items in
the control is decreased.

See #12378.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66141 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/test_test_gui.dsp

@@ -501,6 +501,10 @@ SOURCE=.\controls\treectrltest.cpp
 # End Source File
 # Begin Source File
 
+SOURCE=.\controls\virtlistctrltest.cpp
+# End Source File
+# Begin Source File
+
 SOURCE=.\controls\windowtest.cpp
 # End Source File
 # Begin Source File