Manual testing - data points in tst_minimalscatter stay hidden

In the manual test tst_minimalscatter, the data points will stay hidden after being deselected.

Steps to reproduce:

1. Left-click one of the data points.
2. Left-click another data point. Notice that the previously selected data point is now invisible.
3. Left-click the last data point. Notice that both the previously selected data points are now invisible.
4. Left-click the background. Notice that all data points are now visible.
5. Repeat step 1 to step 3, and rotate the graph. Notice that all data points are now visible.

Expected behavior:

The data points should return to their regular color when no longer selected.

Observed behavior:

The data points are made hidden when selected, but they stay hidden after being deselected. The hidden data points are only made visible again if you left-click the background, thus clearing the selection, or if you rotate the graph.