Fixes for touchscreen interaction

Marco Martinrequested to merge
work/cherry-pick-96787a7c into Plasma/6.1
  • Manage TouchCancel
  • Only support press and hold with exactly one touchpoint

CCBUG:482222 Doesn't fully fix the bug but mitigates it, it needs some changes in plasma-desktop as well for a full fix

(cherry picked from commit 96787a7c)

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