REGRESSION: Desk.cpl unduly reverts to default background

reactos-bootcd-0.4.16-dev-2299-g492aeb6-x86-gcc-lin-dbg

Guilty commit: https://github.com/reactos/reactos/commit/3016c40dc72e25a7354d7ae50b109fa0454ba24f by katayama_hirofumi_mz in https://github.com/reactos/reactos/pull/8670

• Create a .bmp
• Open desk.cpl
• Set it as background in desk.cpl
• click "OK"
• .bmp used as background,  and "Wallpaper" regkey is set to path to the .bmp file
• Open desk.cpl
• .bmp is "selected" in list (default) ...
• ... but rendered with "default" (blue)

• change nothing, click "OK"
• default background is set and "Wallpaper" regkey is set to NULL string
• re-open desk.cpl
• .bmp is no longer listed

Guilty code is : https://git.reactos.org/?p=reactos.git;a=blob;f=dll/cpl/desk/background.c#l345 where LVIS_SELECTED is set before adding the file to the list while it used to be after the file addition before the guilty commit, and now triggering LVN_ITEMCHANGED at the incorrect time.