In edit mode, the "Select Random" operator selected the inverse.
For a probability of 1, no elements were selected and vice versa.
This was because the selection actually deselects elements, but used a
mask of elements that was not inverted.
The fix takes the complement of the mask of elements, so the deselection
now does the right thing.
Pull Request: https://projects.blender.org/blender/blender/pulls/110963
5eef5b0d61