[SDL] Patch for X11 BadValue errors on SDL_UpdateWindowRects

[Marcus von Appen]

Hi,

using SDL_UpdateWindowRects () with SDL_Rect instances that do not clip
to the bounds of the SDL_Window causes a BadValue error on X11, if
shared memory is enabled:

X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  142 (MIT-SHM)
  Minor opcode of failed request:  3 (X_ShmPutImage)
  Value in failed request:  0x5
  Serial number of failed request:  67
  Current serial number in output stream:  70

Attached is a test program to recreate the behaviour (please give it a
try to see, if it fails for you, too) along with a simple patch for
SDL_x11framebuffer.c (rev. 6303), which reduces the rect area to the
window bounds.

I am not sure, if XPutImage() is more robust here, so I applied it to
the non-shared memory version, too.

Regards
Marcus
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