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Fix touch pan gesture stopping when moving quickly

Alvin Wong requested to merge alvinwong/krita:alvin/touch-pan-fix into master

The code before this change ignores large movements to prevent canvas from jumping at the end of a 3-finger gesture, which also blocks fast panning. This removes the movement delta check in favour of checking the number of touch points, so that fast movements will no longer interrupts the pan gesture.

BUG: 441706 https://bugs.kde.org/show_bug.cgi?id=441706

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  • I confirmed this builds.
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