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-rw-r--r--layout/base/nsCSSFrameConstructor.cpp13
-rw-r--r--layout/generic/nsFrame.cpp4
-rw-r--r--layout/generic/nsIFrame.h7
-rw-r--r--layout/generic/nsIFrameInlines.h13
4 files changed, 33 insertions, 4 deletions
diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp
index a2dec55e1..e88b2d62c 100644
--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -10730,6 +10730,12 @@ nsCSSFrameConstructor::AddFCItemsForAnonymousContent(
// first element that is not itself NAC (distinct from whether it happens
// to be in a NAC subtree).
//
+ // The one exception to all of this is scrollbar content, which we parent
+ // directly to the scrollframe. This is because the special-snowflake
+ // construction of scroll frames doesn't result in the placeholder frame
+ // being constructed until later, which means that GetInFlowParent() doesn't
+ // work right in the case of out-of-flow scrollframes.
+ //
// To implement all this, we need to pass the correct parent style context
// here because SetPrimaryFrame() may not have been called on the content
// yet and thus ResolveStyleContext can't find it otherwise.
@@ -10739,9 +10745,12 @@ nsCSSFrameConstructor::AddFCItemsForAnonymousContent(
// to worry about anonymous boxes, which CorrectStyleParentFrame handles
// for us.
nsIFrame* inheritFrame = aFrame;
- while (inheritFrame->GetContent()->IsNativeAnonymous()) {
- inheritFrame = inheritFrame->GetParent();
+ if (!content->IsNativeScrollbarContent()) {
+ while (inheritFrame->GetContent()->IsNativeAnonymous()) {
+ inheritFrame = inheritFrame->GetInFlowParent();
+ }
}
+
if (inheritFrame->GetType() == nsGkAtoms::canvasFrame) {
// CorrectStyleParentFrame returns nullptr if the prospective parent is
// the canvas frame, so avoid calling it in that situation.
diff --git a/layout/generic/nsFrame.cpp b/layout/generic/nsFrame.cpp
index 2b81ce83b..71f6172bd 100644
--- a/layout/generic/nsFrame.cpp
+++ b/layout/generic/nsFrame.cpp
@@ -8964,10 +8964,10 @@ GetCorrectedParent(const nsIFrame* aFrame)
nsIContent* content = aFrame->GetContent();
Element* element =
content && content->IsElement() ? content->AsElement() : nullptr;
- if (element && element->IsNativeAnonymous() &&
+ if (element && element->IsNativeAnonymous() && !element->IsNativeScrollbarContent() &&
element->GetPseudoElementType() == aFrame->StyleContext()->GetPseudoType()) {
while (parent->GetContent() && parent->GetContent()->IsNativeAnonymous()) {
- parent = parent->GetParent();
+ parent = parent->GetInFlowParent();
}
}
diff --git a/layout/generic/nsIFrame.h b/layout/generic/nsIFrame.h
index 93eb95099..3137aaee2 100644
--- a/layout/generic/nsIFrame.h
+++ b/layout/generic/nsIFrame.h
@@ -721,6 +721,13 @@ public:
* Accessor functions for geometric parent.
*/
nsContainerFrame* GetParent() const { return mParent; }
+
+ /**
+ * Gets the parent of a frame, using the parent of the placeholder for
+ * out-of-flow frames.
+ */
+ inline nsContainerFrame* GetInFlowParent();
+
/**
* Set this frame's parent to aParent.
* If the frame may have moved into or out of a scrollframe's
diff --git a/layout/generic/nsIFrameInlines.h b/layout/generic/nsIFrameInlines.h
index eb9a7202a..3068c9f79 100644
--- a/layout/generic/nsIFrameInlines.h
+++ b/layout/generic/nsIFrameInlines.h
@@ -8,8 +8,10 @@
#define nsIFrameInlines_h___
#include "nsContainerFrame.h"
+#include "nsPlaceholderFrame.h"
#include "nsStyleStructInlines.h"
#include "nsCSSAnonBoxes.h"
+#include "nsFrameManager.h"
bool
nsIFrame::IsFlexItem() const
@@ -160,4 +162,15 @@ nsIFrame::BaselineBOffset(mozilla::WritingMode aWM,
return SynthesizeBaselineBOffsetFromBorderBox(aWM, aBaselineGroup);
}
+nsContainerFrame*
+nsIFrame::GetInFlowParent()
+{
+ if (GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
+ nsFrameManager* fm = PresContext()->FrameManager();
+ return fm->GetPlaceholderFrameFor(FirstContinuation())->GetParent();
+ }
+
+ return GetParent();
+}
+
#endif