[Lazarus] Strange screen flickering Lazarus revision > 57000

[Landmesser John]

i have lazarus trunk revision 57333 and observe strange screen 
flickering with a DBGrid and Oracle Database connection.

See Revision 57000 without flickering

https://drive.google.com/file/d/1671s-JuIM5z7KkwRU8pbX6Nqt53sDACI/view?usp=sharing

( hope that link is ok )

compare with Revision 57333,  heavy screen flickering

https://drive.google.com/file/d/1yZHltOBPt47i6S2jeovGu9W3ScUX8-Zg/view?usp=sharing


Info:

Lazarus 1.9.0 57333 FPC 3.0.4 i386-win32-win32/win64

Windows XP SP3


No flickering with same app and Windows 2003 !!