[Webkit-unassigned] [Bug 164987] New: Touchscreen- Single finger events register as multi-touch events after clicking certain webpage elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=164987

            Bug ID: 164987
           Summary: Touchscreen- Single finger events register as
                    multi-touch events after clicking certain webpage
                    elements
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: polypeptide4 at gmail.com
                CC: bugs-noreply at webkitgtk.org

On a touchscreen, a single finger scroll starts registering as a multi-finger zoom gesture after certain interactions with webpage elements. Scroll up starts registering as zoom-out and scroll-down as zoom-in. Single finger events including clicks stop registering after this has happened, even after reloading the page.  

I can consistently replicate this on full-screen HTML5 videos (eg on youtube) after touching the "seek" bar at the bottom of the video. Also on any duck-duck-go search page (example: https://duckduckgo.com/?q=webkit), after tapping the "settings" buton on the top right of the page.  
Note: Clicking these elements with the mouse does not produce the bug, only when tapping them with the touchscreen.  

I wonder if the complex html5 elements on these pages is causing this (the settings button on duck-duck-go is supposed to animate a slide-out pane for example).

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