[Webkit-unassigned] [Bug 178853] New: REGRESSION(r223264): [GTK] Mouse clicks are ignored in pages using Polymer library

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=178853

            Bug ID: 178853
           Summary: REGRESSION(r223264): [GTK] Mouse clicks are ignored in
                    pages using Polymer library
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: Gtk
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cgarcia at igalia.com
                CC: bugs-noreply at webkitgtk.org, cdumez at apple.com,
                    rniwa at webkit.org

For some reason now that we expose MouseEvent.buttons polymer is ignoring mouse clicks. It can be reproduced in https://material.io/icons/, scroll down and try to click in any of the icons. The icon should be selected, but nothing happens. The problem is that now polymer is always returning False from shouldTap. I've implemented buttons in GTK port and tried again, but still doesn't work. It works when actually tapping with a real touch screen, though so I guess this is working in Mac because touch events are disabled. I'm not sure if it's a bug in WebKit or polymer because I don't really understand the javascript code there. This is the js snippet:

            shouldTap: function(e, t) {
                var n = !0;
                return "mouse" === e.pointerType && (n = 1 ^ e.buttons && 1 & t.buttons), n && !e.tapPrevented
            },
            up: function(t) {
                var r = i.get(t.pointerId);
                if (r && this.shouldTap(t, r)) {
                    var s = e.targetFinding.LCA(r.target, t.relatedTarget);
                    if (s) {
                        var o = n.makeGestureEvent("tap", {
                            bubbles: !0,
                            cancelable: !0,
                            x: t.clientX,
                            y: t.clientY,
                            detail: t.detail,
                            pointerType: t.pointerType,
                            pointerId: t.pointerId,
                            altKey: t.altKey,
                            ctrlKey: t.ctrlKey,
                            metaKey: t.metaKey,
                            shiftKey: t.shiftKey,
                            _source: "tap"
                        });
                        s.dispatchEvent(o)
                    }
                }
                i["delete"](t.pointerId)
            }

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