Avoid locking in premature size in CEF

gistfile1.cs

bool setInitialSize = false;

protected override void OnSizeChanged(EventArgs e)
{
    base.OnSizeChanged(e);
    if (setInitialSize && managedCefBrowserAdapter != null)
        managedCefBrowserAdapter.OnSizeChanged();
}

protected override void OnVisibleChanged(EventArgs e)
{
    base.OnVisibleChanged(e);
    // We must wait until the control is visible before calling OnSizeChanged.
    // Otherwise CEF will lock in first size we called it with until the next paint,
    // and our custom form sizing may further change the size upon OnShown().
    if (Visible && !setInitialSize && managedCefBrowserAdapter != null) {
        MethodInvoker mi = () => {
            managedCefBrowserAdapter.OnSizeChanged();
            this.setInitialSize = true;
        };
        BeginInvoke((Delegate)mi);
    }
}