I have very simple QT application using eglfs platform plugin, so it's works like a charm on very common SoC. QT renders output directly to framebuffer.
Because of some peculiarity, content of framebuffer can be erased outside of QT app. In this case I want to force top-level widget to redraw .
Unfortunately all available snippets not works for me:
repaint();
update();
update(geometry());
...etc
Only one exception is sequential call of setWindowOpacity(0), and then setWindowOpacity(1.0); Perhaps it works, but I don't like such solution because overkill and unnecessary flickering.
So please suggest me how to properly force eglfs window to repaint immediately.
Will be grateful for any help.
