SDL 1.3 backend: Test failure on resize event

Hello all,

I have been using testbitmap and testalpha to test the rendering code for
the Haiku 1.3 event. I notice that SDL is not requesting a new framebuffer
on every resize event. It does so for most of the events generated by
testalpha, but none of the ones generated by testbitmap. I suspect this is
causing a problem where testbitmap has a large black area in the window when
the window is made larger, and a problem where testalpha crashes if the
window is resized too fast (it crashes on a memcpy() instruction in the
drawing thread). Does anyone know why this might be? Shouldn’t a resize
event or similar always require the creation of a new framebuffer?