winsys/svga: fix display corruption after surface_init
Cherry-pick of commit f41848a9 to fix display corruption in KDE Fixes: ba37d408 ("svga: Performance fixes") Closes: #3599 (closed)
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Cherry-pick of commit f41848a9 to fix display corruption in KDE Fixes: ba37d408 ("svga: Performance fixes") Closes: #3599 (closed)