Fix WebGL always presenting latest bound FBO #2895
Merged
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When working on #2892, I noticed that when using WebGL with the GL backend, the latest bound FBO was being blitted to the default framebuffer, instead of the correct swapchain FBO.
The changes in this PR fix this issue while:
PR checklist:
make
succeeds (on *nix)make reftests
succeedsrustfmt
run on changed code