[Ohrrpgce] SVN: teeemcee/10087 gfx_sdl/X11: Fix window ending up the wrong size if the window is resize

[subversion at HamsterRepublic.com]

teeemcee
2018-03-08 08:27:51 -0800 (Thu, 08 Mar 2018)
205
gfx_sdl/X11: Fix window ending up the wrong size if the window is resized while being dragged

This looks like an SDL bug to me.
I can't test gfx_sdl2 for the same bug, due to a GLX problem on my computer.
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U   wip/gfx_sdl.bas