Keep cumulated error negligible for rapidly increasing functions
Summary: The current scheme violates Runge-Kutta condition on error O(h^4) when dy is too high. This leads to visible shifting and discontinuities on the plots of integrals for e^x^2, e^abs(x), etc. BUG: 341256 Test Plan: 1. Compile and install KmPlot. 2. Create the Cartesian plot "f(x) = e^x^2". 3. Switch to the "Integral" tab and tick the "Show integral" item. 4. Try to change the scale (Ctrl+mouse wheel). The integral curve should be plotted as expected (no discontinuities, no extra lines on Ox). f(x)=e^x^2 and its integral Before the patch: {F7764991} After the patch: {F7764992} Reviewers: #kde_edu Subscribers: aacid, cfeck, kde-edu Tags: #kde_edu Differential Revision: https://phabricator.kde.org/D24972
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