FullscreenPreview has no WA_DeleteOnClose and Qt's C++ dtor does
not reliably call Python-side destroy() overrides once
popout_controller drops its reference, so the popout's separate
mpv instance + NVDEC surface pool leaked until the next full
Python GC cycle. closeEvent now calls _gl_widget.cleanup()
explicitly after the state machine's CloseRequested dispatch.
behavior change from v0.2.6: popout open/close cycles no longer
stair-step VRAM upward; the popout's mpv is torn down immediately
on close instead of waiting on GC.
pax
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