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Bug 5517

Summary: Windows-specific: wrong window size after SDL_SetWindowResizable()
Product: SDL Reporter: Ivan <cooler>
Component: videoAssignee: Sam Lantinga <slouken>
Status: NEW --- QA Contact: Sam Lantinga <slouken>
Severity: minor    
Priority: P2    
Version: 2.0.14   
Hardware: x86   
OS: Windows 8   

Description Ivan 2021-01-29 10:04:27 UTC 
Under Windows:
 1. Create a window without SDL_WINDOW_RESIZABLE flag 
 2. Call SDL_SetWindowResizable() to make it resizable.
 3. Try to resize it and get a SDL_WINDOWEVENT_SIZE_CHANGED with WRONG window size (width and height is decreased by 10).

This happens if no SDL_SetWindowSize() is called between 2 and 3. 
Because Windows needs to update window size via MoveWindow() when window's style (border type) is changed, otherwise it reports wrong client area.
Comment 1 Ivan 2021-01-29 10:06:46 UTC 
I'd suggest to add MoveWindow() call after SetWindowLong() in WIN_SetWindowResizable() in SDL_windowswindow.c