If this sounds like your week
Artifacts are not cosmetic—they’re correctness bugs
A border offset on the docked 4K panel means clicks miss expectations and users blame the host app.
Where tooling usually breaks
Single-monitor assumptions fail on hybrid fleets
Laptops with 125% internal + 100% external displays need recomputation on `WM_DPICHANGED` style transitions—not one static scale factor forever.
Win32 cues
Transparency: WS_EX_LAYERED | WS_EX_TRANSPARENT Bounds: monitor-aware width/height from target HWND Fallback: CreateDIBSection for bitmap border path Hygiene: ReleaseDC after GetWindowDC usage