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Found an interesting quirk on #slackware wherein KDE's touchpad configuration was not disabling one-tap dragging, which was absolutely driving me nuts, until I discovered it needs to be disabled in synclient. #linux
Tried messing around with tap sensitivity within KDE's config, but little helped
Before this, simply moving the mouse across the display would periodically grab a window, or tabs would move/open, or video playback would pause.