How much gap is gapless? about dwm-win32 HOT 2 OPEN

i partially fixed that issue for me by modifing the call to SetWindowPos with some offsets, since the space is added by windows
and it seems to be a fixed size for win10
in function resize:
SetWindowPos(c->hwnd, HWND_TOP, c->x - 7, c->y, c->w + 14, c->h + 7, SWP_NOACTIVATE);
its not a pretty solution because of the fixed numbers and all, but it solved it for me
also if someone is interested in solving it for real there seems to be a way to get those offsets directly from windows using DwmGetWindowAttribute and DWMWA_EXTENDED_FRAME_BOUNDS
https://stackoverflow.com/questions/34139450/getwindowrect-returns-a-size-including-invisible-borders

from dwm-win32.

Is there any possibility this could be connected to Windows' padded border width, changeable in the registry? https://superuser.com/questions/1758977/how-to-change-border-width-in-ms-windows-to-grab-and-resize-it

from dwm-win32.