Dang...
I was just using gfx_sdl2 on Linux and found that it was crashing a lot all
over the place (memory corruption) when resizing the window, and crashing
faster the larger you resize the window. At first I thought that this bug
(1181) was maybe gfx_sdl2/x86_64 specific, not Mac-specific. Eventually I
discovered that the crash was because in `present_internal` in gfx_sdl2,
`imagesz` was not equal to `buffersize` and `screenbuffer` during a resize.
But the crash went away when I recompiled, and I realised that my previous
build just so happened to be performed on a temp git branch I had used under
Mac while hunting this bug (1181). Examining the branch, I see I had commented
out `set_window_size(imagesz, zoom)` in `present_internal`, explaining the
mismatched sizes.
But... the whole reason I commented out that line was to experiment with the
cause of this bug... maybe I had transformed a rare crash into a frequent one?
I need to re-test on Mac.
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