RenderBase: Fix a VirtualXFB crash #5050
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Since PR #4999 every backend is crashing when using VirtualXFB in both Release and Debug builds on Windows.
The
g_renderervariable is set withstd::make_unique<Renderer>();. The thing is, RendererBase's constructor indirectly dereferenceg_rendererby callingCalculateTargetSize()which is callingFramebufferManagerBase::ScaleToVirtualXfbWidth/Heightand might dereference something that is not initialized.Not sure if it's the right way to patch it. At least, it prevents it to crash.
Ready to be reviewed and merged.