qmlgloverlay: reset gl state after drawing
commit 00777d80
qt/gloverlay: reset OpenGL state after Qt drawing
Reset to the original OpenGL state as required by the OpenGL API
contract. Fixes output with a glimagesink element downstream.
commit d59fa1e8
qt/gloverlay: reset current OpenGL context after Qt
Qt may replace the drawable with its own which breaks output if Qt is
not displaying the resulting video as used with e.g. glimagesink.