Skype 6.0.0.120's Installer : Can't move window, nor close with X nor open system menu

reactos-bootcd-0.4.15-dev-7777-g2f6b175-x86-gcc-lin-dbg

 reactos-bootcd-0.4.15-dev-7749-gacb01cf-x86-gcc-lin-dbg
 reactos-bootcd-0.4.15-dev-7750-gc17a654-x86-gcc-lin-dbg
REGRESSION confirmed.
Guilty commit : https://github.com/reactos/reactos/commit/c17a6542ac329160ce627267babc8c7ec67b1e86 from DougLyons in https://github.com/reactos/reactos/pull/6427 using a patch from I_Kill_Bugs in the attempt to fix CORE-14436 and CORE-16985

Similar to CORE-19538 (but this one also show regression on Accelerators message while here it's mouse messages only)

Skype 6 installer from CORE-15218 or CORE-7344 

Can't move window with title bat
Can't close with X, nor minimize
Can't open system menu (main icon)