Must click twice to expand point to polygon

[forman]

Expected behavior

When Cate Desktop is about to display large shapefiles or shapefiles with polygons with a large number of coordinates on a 3D globe it will display point proxies first. If users zoom in and click such point, actual polygon coordinates are loaded and polygon should displayed.

Actual behavior

The polygons are only loaded(?) / displayed a second points or sometimes even more points have been clicked. This is either a display update problem or a problem in the Python back-end.

Note: by default, Cesium refreshes/re-renders in fixed time intervals. We disabled this behavior in Cate Desktop, because it caused a 100% GPU usage on Laptops without users doing anything, hence wasting electricity.

Steps to reproduce the problem

1. open one of the Glaciers CCI Shapefiles, e.g. Greenland
2. see points displayed on 3D globe
3. zoom in and click point --> nothing happens
4. click other points --> polygon loaded and displayed

Specifications

Cate 2.0.dev15