147668 2015-08-04 17:46:41 -0700 REGRESSION (r173784): [Mac] Correct latching error for non-scrollable iframe nested inside scrollable div. 2015-08-05 03:50:03 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Mac All RESOLVED FIXED InRadar P2 Normal --- 1 bfulgham bfulgham bfulgham simon.fraser oldest_to_newest 1114899 0 bfulgham 2015-08-04 17:46:41 -0700 The WebKit latching logic improperly causes the main frame to scroll in the following case: 1. The page contains an iframe that is sized so that its contents do not need to scroll. 2. The iframe is marked as "overflow: hidden" 3. The iframe is contained in a div, which is sized so that it needs to scroll. When this happens, the latching logic improperly skips the containing div, and passes the wheel events to the main frame. 1114902 1 bfulgham 2015-08-04 17:47:48 -0700 <rdar://problem/21870332> 1114911 2 bfulgham 2015-08-04 18:03:12 -0700 This bug was caused by the following: 1. When latching, we evaluate each new wheel event and decide if we should identify the element to latch to, or if we are continuing a set of gestures that are already tied to an existing element. 2. If we are already latched, we pass wheel events to the latched element until we hit the edge of the scrollable region. 3. However, if we have nested scrolling contexts, and we are processing wheel events in the context of a nested frame, we do not want to pass events to the latched element. Consequently, in EventHandler::platformPrepareForWheelEvents, if we find that latchingIsLockedToAncestorOfThisFrame is true we exit early and do not pass events to the latched element. The bug was that EventHandler::platformCompleteWheelEvent was not handling the nested latch case properly. It was grabbing the current latching state, regardless of whether it applied to the current frame or not. In the case where we were latched to an element in an enclosing frame, we would reach up to the enclosing frame and pass the wheel events to its enclosing view (in this case, the Main Frame). Instead, we need to perform the same short-circuit we do when beginning processing the wheel event. If we are latched to an enclosing context, we should skip the logic of finding the scrolling container for the latched element. Instead, we should just give the current element the opportunity to handle the wheel event (in case the user provided handlers for it), and then return. 1114916 3 258250 bfulgham 2015-08-04 18:08:56 -0700 Created attachment 258250 Patch 1114921 4 258250 simon.fraser 2015-08-04 18:13:56 -0700 Comment on attachment 258250 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=258250&action=review > Source/WebCore/ChangeLog:9 > + Test: platform/mac/fast/scrolling/scroll-div-with-nested-nonscrollable-iframe.html The new hotness is to put the test in fast/scrolling/scroll-div-with-nested-nonscrollable-iframe.html but I haven't moved platform/mac/fast/scrolling yet so you're OK. 1114927 5 bfulgham 2015-08-04 18:26:25 -0700 Committed r187930: <http://trac.webkit.org/changeset/187930> 1114956 6 simon.fraser 2015-08-04 21:23:41 -0700 The new test is timing out: https://build.webkit.org/results/Apple%20Yosemite%20Release%20WK1%20(Tests)/r187935%20(7289)/results.html 1115004 7 258250 koivisto 2015-08-05 03:50:03 -0700 Comment on attachment 258250 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=258250&action=review > LayoutTests/platform/mac/fast/scrolling/scroll-div-with-nested-nonscrollable-iframe.html:87 > + if (window.eventSender) { > + testRunner.waitUntilDone(); Not sure if this is why it is timing out but the correct way to make an async test using js-test-post-pre/js-test-post-post is jsTestIsAsync = true; on top of the test and finishJSTest() to end it. Explicit testRunner.waitUntilDone()/testRunner.notifyDone() are not needed. 258250 2015-08-04 18:08:56 -0700 2015-08-04 18:13:56 -0700 Patch bug-147668-20150804180849.patch text/plain 9528 bfulgham SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDE4NzkyNSkKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDI1IEBACisyMDE1LTA4LTA0ICBCcmVudCBG dWxnaGFtICA8YmZ1bGdoYW1AYXBwbGUuY29tPgorCisgICAgICAgIFJFR1JFU1NJT04gKHIxNzM3 ODQpOiBbTWFjXSBDb3JyZWN0IGxhdGNoaW5nIGVycm9yIGZvciBub24tc2Nyb2xsYWJsZSBpZnJh bWUgbmVzdGVkIGluc2lkZSBzY3JvbGxhYmxlIGRpdi4KKyAgICAgICAgaHR0cHM6Ly9idWdzLndl YmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTE0NzY2OAorICAgICAgICA8cmRhcjovL3Byb2JsZW0v MjE4NzAzMzI+CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAg ICAgVGVzdDogcGxhdGZvcm0vbWFjL2Zhc3Qvc2Nyb2xsaW5nL3Njcm9sbC1kaXYtd2l0aC1uZXN0 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