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@@ -0,0 +1,34 @@
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+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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+From: David Bokan <[email protected]>
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+Date: Thu, 28 Jul 2022 18:09:13 +0000
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+Subject: Prevent handling input for provisional frames
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+
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+Bug: 1347644,1322812
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+Change-Id: Ifd60f6aa593ce23ca6cbb65552fc9fb8f8690035
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+Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3791883
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+Commit-Queue: David Bokan <[email protected]>
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+Reviewed-by: Dave Tapuska <[email protected]>
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+Cr-Commit-Position: refs/heads/main@{#1029361}
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+
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+diff --git a/third_party/blink/renderer/core/frame/web_frame_widget_impl.cc b/third_party/blink/renderer/core/frame/web_frame_widget_impl.cc
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+index c7d6c63a3c3b640436835e986d2e03ee232b65f0..6106168562e5300b5d15666e1278b207358c63b8 100644
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+--- a/third_party/blink/renderer/core/frame/web_frame_widget_impl.cc
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++++ b/third_party/blink/renderer/core/frame/web_frame_widget_impl.cc
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+@@ -2448,10 +2448,15 @@ WebInputEventResult WebFrameWidgetImpl::HandleInputEvent(
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+ DCHECK(!WebInputEvent::IsTouchEventType(input_event.GetType()));
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+ CHECK(LocalRootImpl());
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+
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++ // Clients shouldn't be dispatching events to a provisional frame but this
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++ // can happen. Ensure that event handling can assume we're in a committed
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++ // frame.
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++ if (IsProvisional())
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++ return WebInputEventResult::kHandledSuppressed;
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++
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+ // Only record metrics for the root frame.
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+- if (ForTopMostMainFrame()) {
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++ if (ForTopMostMainFrame())
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+ GetPage()->GetVisualViewport().StartTrackingPinchStats();
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+- }
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+
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+ // If a drag-and-drop operation is in progress, ignore input events except
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+ // PointerCancel and GestureLongPress.
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