Mismatched child window positions after resizing SDL window

[jouae]

The SDL backend fails to properly update child window coordinates during main window resizing. When the SDL-managed parent window is resized, the backend's coordinate scaling mechanism doesn't correctly adjust the child windows' positions within the new window dimensions. This coordinate mapping failure in the SDL window management system causes mouse input events to be processed at incorrect positions relative to the visible child windows, breaking user interaction.

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