Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54701
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The private draw texture did not get evicted on reset(), causing us to try to read from a non-existent texture with the new contest. For more details see comment 9 on the bug.
-- v2: ddraw/tests: Show that SYSMEM | 3DDEVICE surfaces don't consume vidmem. ddraw/tests: Native 64 bit ddraw has a video memory leak. wined3d: Make video memory accounting a per-resource flag.