Some clients may want to allow swipes in another view to swipe the WKView regardless of the content of the WKView (so, bypassing normal scrolling). For example, a full-view overlay that displays totally different (but related) content.
Created attachment 230026 [details] patch
Comment on attachment 230026 [details] patch View in context: https://bugs.webkit.org/attachment.cgi?id=230026&action=review > Source/WebKit2/UIProcess/mac/ViewGestureControllerMac.mm:106 > + , m_ignorePinnedState(false) We try to have these be adjective phrases instead of verb phrases. That’s why the name will often be something like m_shouldIgnorePinnedState.
http://trac.webkit.org/changeset/167766