Is there some way to change the rendering order of elements on the canvas? In a plugin I'm working on, I have a large number of vertices implemented with QgsVertexMarker(). As the user selects different vertices, the colour changes from green to red. This all works fine, but it sometimes happens that one vertex is hidden behind another one nearby, and in these cases you can't see the red vertex on the map (see http://snag.gy/9fB5s.jpg for example).
Is there some way to change the rendering order of a vertex to bring it to the top? Regards, Rudi
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