Backport of "d3d11videosink: Prepare window once streaming started" into 1.18
Backport of !1893 (merged) "d3d11videosink: Prepare window once streaming started".
Commits:
- 28174b14 d3d11videosink: Prepare window once streaming started
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Backport of !1893 (merged) "d3d11videosink: Prepare window once streaming started".
Commits: