Painting issues: desktop icons disappear, bottom row in a window doesn't get redrawn

STR:
1. Control panel > Display > Settings (tab) > screen area: change the value.
2. Make sure that 'Properties for Display' window overlaps some icons on the desktop.
3. Hit 'Apply' button in that window.
[Bug: the window's title bar gets drawn gray, as if the window is inactive, but taskbar shows it as the active one.]
4. Hit "Ok" button in that window.
[Bug: desktop icons that were overlapped by that window - get visually lost, moving another window over that area - will redraw them properly (see Attachment 1.]

1. Navigate to C:\Reactos\ and scroll down the window.
[Bug: bottom area contains visual garbage (see Attachment 2).]

1. Run Reactos Applications Manager.
2. Open 'Internet & Network' group (or any other with lots of items there).
3. Resize the window by dragging the bottom right corner to the right & down.
[Bug: visual garbage (see Attachment 3).]