Snapped windows on secondary displays can restore with the primary monitor's taskbar offset. Normalize the saved screen rect using its own monitor inset and reverse that conversion when checking restored placement. Keep missing-monitor fallback coordinates in the creation monitor's workspace.
The Win32 API model changes four-cycle drift from plus or minus 192 pixels to zero. Single-monitor native fullscreen and quit-fullscreen/relaunch roundtrips passed; physical multi-monitor and mixed-DPI verification remains unavailable in the disconnected session.
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