Can't create EGL OpenGL ES context under desktop linux

Under desktop linux, when using "xcb_egl" connection, request for OpenGL ES context failed(It works well when using GLX).

setenv("QT_XCB_GL_INTEGRATION", "xcb_egl", 1)

surf_format.setRenderableType(QSurfaceFormat::OpenGLES)

QOpenGLContext* glctx = new OpenGLContext;

glctx->setFormat(surf_format);

glctx->create();

assert(glctx->isOpenGLES());

The reason is in QEglConfigChooser::chooseConfig(), eglChooseConfig() is called to select compatible config, and EGL will set EGL_RENDERABLE_TYPE attribute to all supported render type(under desktop, including OpenGL and OpenGL ES). Then OpenGL is always selected despite user asking for OES context.

The fix seems trivial, in QEGLPlatformContext::init(), just change

m_format = q_glFormatFromConfig(m_eglDisplay, m_eglConfig);

to

m_format = q_glFormatFromConfig(m_eglDisplay, m_eglConfig, format);

For the same reason, call QOpenGLContext::setNativeHandle() with an EGL OES context is also broken currently.

Please fix this, thanks!