[#12631] - Pie Chart: maxCount: wrong rendering of slices with equal value

Example:

Label Value
A 300
B 300
C 100
D 50

maxCount: 1

Expected: two slices, A:300, Other:450
Actual: three slices, A:300, B:300 and Other:150

In general: this happens when maxCount cuts sorted (by value) slices where values are equal.