[FEATURE] Make brush 'speed' sensor work
Implemented a complex smoothing algorithm for speed sensor, which makes Speed work almost perfectly. The smoothing is two-stage: 1) Calculate the distance of the path connecting last 10 points (but not longer than 300px). 2) Divide the distance by time value and smooth the result further with 10 previous values BUG:325423 Fixes:T426 CC:kimageshop@kde.org
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