On Fri, 09 Feb 2018 22:30:24 GMT, Luís Marques wrote:

On Fri, 9 Feb 2018 23:11:13 +0100, Mike Wey wrote:

Is the drawing handler actually called? you may need to invalidate the
DrawingArea by calling queueDraw in the OnFocusIn handler.

Yes. I'm sure about that.

Any more ideas?