Windows allows windows to be resized to zero height.

Changed the window client rect validation to take this into account.

Fixes https://github.com/libsdl-org/SDL/issues/9796

src/core/windows/SDL_windows.h

@@ -156,8 +156,8 @@ extern BOOL WIN_IsEqualIID(REFIID a, REFIID b);
 extern void WIN_RECTToRect(const RECT *winrect, SDL_Rect *sdlrect);
 extern void WIN_RectToRECT(const SDL_Rect *sdlrect, RECT *winrect);
 
-// Returns true if the rect is empty
-extern BOOL WIN_IsRectEmpty(const RECT *rect);
+// Returns false if a window client rect is not valid
+bool WIN_WindowRectValid(const RECT *rect);
 
 extern SDL_AudioFormat SDL_WaveFormatExToSDLFormat(WAVEFORMATEX *waveformat);