Snapping the window with Aero Snap (edge drag, Win+Arrow, Snap Layouts)
and quitting restored it where it sat before the snap. Windows keeps a
snapped window in the "arranged" state: GetWindowPlacement still reports
SW_SHOWNORMAL with the pre-snap rect in rcNormalPosition, so the saved
placement never reflected what was on screen.
Resolve IsWindowArranged from user32 at runtime (exported since Windows
10 1903, no header declaration) and, when the window is arranged, save
GetWindowRect converted to workspace coordinates instead. The same
correction covers the pre-fullscreen placement captured by the native
fullscreen toggle. Relaunch lands a normal window on the snapped rect;
there is no API to re-enter the snapped state.
close#1895
edde746
41c92b6324