Fix Avalonia main window growing on every restart (Windows)#5056
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Marc-André Moreau (mamoreau-devolutions)
approved these changes
Jul 7, 2026
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This pull request improves the reliability of restoring the main window's size on Windows by addressing a long-standing issue with frame drift when reopening the application. The changes ensure that the window's outer size is restored exactly as saved, preventing gradual inflation of the window over multiple launches.
Window geometry restoration improvements:
_pendingRestoreWidthand_pendingRestoreHeightfields to temporarily store the saved window size for native restoration on Windows.RestoreGeometry()to set these pending size fields on Windows, instead of relying solely on Avalonia'sWidthandHeightsetters, which previously caused window size drift.OnOpened()to natively restore the window's outer size usingSetWindowPosand DPI scaling, ensuring the restored size matches the original exactly and eliminating frame drift.