wined3d: Add a comment about reset during focus change.
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@ -1176,6 +1176,11 @@ void swapchain_update_draw_bindings(struct wined3d_swapchain *swapchain)
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void wined3d_swapchain_activate(struct wined3d_swapchain *swapchain, BOOL activate)
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{
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/* This code is not protected by the wined3d mutex, so it may run while
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* wined3d_device_reset is active. Testing on Windows shows that changing
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* focus during resets and resetting during focus change events causes
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* the application to crash with an invalid memory access. */
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if (activate)
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{
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if (!(swapchain->device->create_parms.flags & WINED3DCREATE_NOWINDOWCHANGES))
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