[COMCTL32] Fix combo box crash on WPS Office 2016 v10.1.0.5614 install #6870
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Patch by @I_Kill_Bugs
Purpose
Fix crash in comctl32 combobox on WPS Office install.
JIRA issue: CORE-12033
Proposed changes
Only use 'RedrawWindow' from CBResetPos in combo.c when items in combobox != 0.
From @I_Kill_Bugs:
The combobox was sent a WM_PAINT message that it wasn't expecting
which caused the ATL based installer control to try and access listbox strings
that haven't been added yet causing the exception.