kpfont integrals have a lot of empty space both on the left and on the right ever with smashoperator:

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How do I kern the function "into" the integral and reduce the white space of the left document-wide?



I = \int_{t_{k}}^{t_{k+1}} f(t) dt

SMOP = \smashoperator{\int_{t_{k}}^{t_{k+1}}} f(t) dt

I have found a partial solution in How can I redefine \int to put a negative space after the integral sign, but keep the limits properly set?

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