Bug 1419964 - Remove AdjustParentFrameForAfterContent

Tag #1375

1 files changed, 70 insertions, 147 deletions

diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp
index 37d1a2cff5..f69ffe6030 100644
--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -6324,131 +6324,24 @@ nsCSSFrameConstructor::GetFloatContainingBlock(nsIFrame* aFrame)
 }
 
 /**
- * This function will check whether aContainer has :after generated content.
- * If so, appending to it should actually insert.  The return value is the
- * parent to use for newly-appended content.  *aAfterFrame points to the :after
- * frame before which appended content should go, if there is one.
- */
-static nsContainerFrame*
-AdjustAppendParentForAfterContent(nsFrameManager* aFrameManager,
-                                  nsIContent* aContainer,
-                                  nsContainerFrame* aParentFrame,
-                                  nsIContent* aChild,
-                                  nsIFrame** aAfterFrame)
-{
-  // If the parent frame has any pseudo-elements or aContainer is a
-  // display:contents node then we need to walk through the child
-  // frames to find the first one that is either a ::after frame for an
-  // ancestor of aChild or a frame that is for a node later in the
-  // document than aChild and return that in aAfterFrame.
-  nsIFrame* afterBeforeOwnerFrame =
-    nsLayoutUtils::FirstContinuationOrIBSplitSibling(aParentFrame);
-  if (afterBeforeOwnerFrame->GetProperty(nsIFrame::GenConProperty()) ||
-      nsLayoutUtils::HasPseudoStyle(aContainer, aParentFrame->StyleContext(),
-                                    CSSPseudoElementType::after,
-                                    aParentFrame->PresContext()) ||
-      aFrameManager->GetDisplayContentsStyleFor(aContainer)) {
-    nsIFrame* afterFrame = nullptr;
-    nsContainerFrame* parent =
-      static_cast<nsContainerFrame*>(aParentFrame->LastContinuation());
-    bool done = false;
-    while (!done && parent) {
-      // Ensure that all normal flow children are on the principal child list.
-      parent->DrainSelfOverflowList();
-
-      nsIFrame* child = parent->GetChildList(nsIFrame::kPrincipalList).LastChild();
-      if (child && child->IsPseudoFrame(aContainer) &&
-          !child->IsGeneratedContentFrame()) {
-        // Drill down into non-generated pseudo frames of aContainer.
-        nsContainerFrame* childAsContainer = do_QueryFrame(child);
-        if (childAsContainer) {
-          parent = nsLayoutUtils::LastContinuationWithChild(childAsContainer);
-          continue;
-        }
-      }
-
-      for (; child; child = child->GetPrevSibling()) {
-        nsIContent* c = child->GetContent();
-        if (child->IsGeneratedContentFrame()) {
-          nsIContent* p = c->GetParent();
-          if (c->NodeInfo()->NameAtom() == nsGkAtoms::mozgeneratedcontentafter) {
-            if (!nsContentUtils::ContentIsDescendantOf(aChild, p) &&
-                p != aContainer &&
-                nsContentUtils::PositionIsBefore(p, aChild)) {
-              // ::after generated content for content earlier in the doc and not
-              // for an ancestor.  "p != aContainer" may seem redundant but it
-              // checks if the ::after belongs to the XBL insertion point we're
-              // inserting aChild into (in which case ContentIsDescendantOf is
-              // false even though p == aContainer).
-              // See layout/reftests/bugs/482592-1a.xhtml for an example of that.
-              done = true;
-              break;
-            }
-          } else if (nsContentUtils::PositionIsBefore(p, aChild)) {
-            // Non-::after generated content for content earlier in the doc.
-            done = true;
-            break;
-          }
-        } else if (nsContentUtils::PositionIsBefore(c, aChild)) {
-          // Content is before aChild.
-          done = true;
-          break;
-        }
-        afterFrame = child;
-      }
-
-      parent = static_cast<nsContainerFrame*>(parent->GetPrevContinuation());
-    }
-    if (afterFrame) {
-      *aAfterFrame = afterFrame;
-      return afterFrame->GetParent();
-    }
-  }
-
-  *aAfterFrame = nullptr;
-
-  if (IsFramePartOfIBSplit(aParentFrame)) {
-    // We might be in a situation where the last part of the {ib} split was
-    // empty.  Since we have no ::after pseudo-element, we do in fact want to be
-    // appending to that last part, so advance to it if needed.  Note that here
-    // aParentFrame is the result of a GetLastIBSplitSibling call, so must be
-    // either the last or next to last ib-split sibling.
-    nsContainerFrame* trailingInline = GetIBSplitSibling(aParentFrame);
-    if (trailingInline) {
-      aParentFrame = trailingInline;
-    }
-
-    // Always make sure to look at the last continuation of the frame
-    // for the {ib} case, even if that continuation is empty.  We
-    // don't do this for the non-ib-split-frame case, since in the
-    // other cases appending to the last nonempty continuation is fine
-    // and in fact not doing that can confuse code that doesn't know
-    // to pull kids from continuations other than its next one.
-    aParentFrame =
-      static_cast<nsContainerFrame*>(aParentFrame->LastContinuation());
-  }
-
-  return aParentFrame;
-}
-
-/**
  * This function will get the previous sibling to use for an append operation.
- * it takes a parent frame (must not be null) and its :after frame (may be
- * null).
+ *
+ * It takes a parent frame (must not be null) and the next insertion sibling, if
+ * the parent content is display: contents or has ::after content (may be null).
  */
 static nsIFrame*
-FindAppendPrevSibling(nsIFrame* aParentFrame, nsIFrame* aAfterFrame)
+FindAppendPrevSibling(nsIFrame* aParentFrame, nsIFrame* aNextSibling)
 {
-  if (aAfterFrame) {
-    NS_ASSERTION(aAfterFrame->GetParent() == aParentFrame, "Wrong parent");
-    NS_ASSERTION(aAfterFrame->GetPrevSibling() ||
-                 aParentFrame->PrincipalChildList().FirstChild() == aAfterFrame,
-                 ":after frame must be on the principal child list here");
-    return aAfterFrame->GetPrevSibling();
-  }
-
   aParentFrame->DrainSelfOverflowList();
 
+  if (aNextSibling) {
+    MOZ_ASSERT(aNextSibling->GetParent() == aParentFrame, "Wrong parent");
+    MOZ_ASSERT(aNextSibling->GetPrevSibling() ||
+               aParentFrame->PrincipalChildList().FirstChild() == aNextSibling,
+               "next sibling must be on the principal child list here");
+    return aNextSibling->GetPrevSibling();
+  }
+
   return aParentFrame->GetChildList(kPrincipalList).LastChild();
 }
 
@@ -7417,7 +7310,7 @@ nsCSSFrameConstructor::ContentAppended(nsIContent*     aContainer,
   // If the frame we are manipulating is a ib-split frame (that is, one
   // that's been created as a result of a block-in-inline situation) then we
   // need to append to the last ib-split sibling, not to the frame itself.
-  bool parentIBSplit = IsFramePartOfIBSplit(parentFrame);
+  const bool parentIBSplit = IsFramePartOfIBSplit(parentFrame);
   if (parentIBSplit) {
 #ifdef DEBUG
     if (gNoisyContentUpdates) {
@@ -7443,36 +7336,63 @@ nsCSSFrameConstructor::ContentAppended(nsIContent*     aContainer,
              parentFrame->GetType() != nsGkAtoms::detailsFrame,
              "Parent frame should not be fieldset or details!");
 
-  // Deal with possible :after generated content on the parent
-  nsIFrame* parentAfterFrame;
-  nsContainerFrame* preAdjustedParentFrame = parentFrame;
-  parentFrame =
-    ::AdjustAppendParentForAfterContent(this, insertion.mContainer, parentFrame,
-                                        aFirstNewContent, &parentAfterFrame);
+  // Deal with possible :after generated content on the parent, or display:
+  // contents.
+  nsIFrame* nextSibling = nullptr;
+  if (GetDisplayContentsStyleFor(insertion.mContainer) ||
+      nsLayoutUtils::GetAfterFrame(insertion.mContainer)) {
+    FlattenedChildIterator iter(insertion.mContainer);
+    iter.Seek(insertion.mContainer->GetLastChild());
+    StyleDisplay unused = UNSET_DISPLAY;
+    nextSibling = FindNextSibling(iter, unused);
+  }
 
-  // See if the containing block has :first-letter style applied.
-  bool haveFirstLetterStyle = false, haveFirstLineStyle = false;
-  nsContainerFrame* containingBlock = GetFloatContainingBlock(parentFrame);
-  if (containingBlock) {
-    haveFirstLetterStyle = HasFirstLetterStyle(containingBlock);
-    haveFirstLineStyle =
-      ShouldHaveFirstLineStyle(containingBlock->GetContent(),
-                               containingBlock->StyleContext());
+  if (nextSibling) {
+    parentFrame = nextSibling->GetParent()->GetContentInsertionFrame();
+  } else if (parentIBSplit) {
+    // We might be in a situation where the last part of the {ib} split was
+    // empty.  Since we have no ::after pseudo-element, we do in fact want to be
+    // appending to that last part, so advance to it if needed.  Note that here
+    // aParentFrame is the result of a GetLastIBSplitSibling call, so must be
+    // either the last or next to last ib-split sibling.
+    if (nsContainerFrame* trailingInline = GetIBSplitSibling(parentFrame)) {
+      parentFrame = trailingInline;
+    }
+
+    // Always make sure to look at the last continuation of the frame
+    // for the {ib} case, even if that continuation is empty.  We
+    // don't do this for the non-ib-split-frame case, since in the
+    // other cases appending to the last nonempty continuation is fine
+    // and in fact not doing that can confuse code that doesn't know
+    // to pull kids from continuations other than its next one.
+    parentFrame =
+      static_cast<nsContainerFrame*>(parentFrame->LastContinuation());
   }
 
+  nsContainerFrame* containingBlock = GetFloatContainingBlock(parentFrame);
+
+  // See if the containing block has :first-letter style applied.
+  const bool haveFirstLetterStyle =
+    containingBlock && HasFirstLetterStyle(containingBlock);
+
+  const bool haveFirstLineStyle =
+    containingBlock &&
+    ShouldHaveFirstLineStyle(containingBlock->GetContent(),
+                             containingBlock->StyleContext());
+
   if (haveFirstLetterStyle) {
-    nsWeakFrame wf(parentAfterFrame);
+    nsWeakFrame wf(nextSibling);
     // Before we get going, remove the current letter frames
     RemoveLetterFrames(mPresShell, containingBlock);
 
-    if (parentAfterFrame && !wf) {
-      // Ouch, parentAfterFrame was a letter frame and we just deleted it!
-      // Retry AdjustAppendParentForAfterContent; fortunately this is rare.
-      parentFrame =
-        ::AdjustAppendParentForAfterContent(this, insertion.mContainer,
-                                            preAdjustedParentFrame,
-                                            aFirstNewContent, &parentAfterFrame);
-      if (parentFrame != preAdjustedParentFrame) {
+    // Reget nextSibling, since we may have killed it.
+    if (nextSibling && !wf) {
+      FlattenedChildIterator iter(insertion.mContainer);
+      iter.Seek(insertion.mContainer->GetLastChild());
+      StyleDisplay unused = UNSET_DISPLAY;
+      nextSibling = FindNextSibling(iter, unused);
+      if (nextSibling) {
+        parentFrame = nextSibling->GetParent()->GetContentInsertionFrame();
         containingBlock = GetFloatContainingBlock(parentFrame);
       }
     }
@@ -7488,7 +7408,7 @@ nsCSSFrameConstructor::ContentAppended(nsIContent*     aContainer,
   nsIAtom* frameType = parentFrame->GetType();
 
   FlattenedChildIterator iter(aContainer);
-  bool haveNoXBLChildren = (!iter.XBLInvolved() || !iter.GetNextChild());
+  const bool haveNoXBLChildren = !iter.XBLInvolved() || !iter.GetNextChild();
   FrameConstructionItemList items;
   if (aFirstNewContent->GetPreviousSibling() &&
       GetParentType(frameType) == eTypeBlock &&
@@ -7513,7 +7433,7 @@ nsCSSFrameConstructor::ContentAppended(nsIContent*     aContainer,
     AddFrameConstructionItems(state, child, false, insertion, items);
   }
 
-  nsIFrame* prevSibling = ::FindAppendPrevSibling(parentFrame, parentAfterFrame);
+  nsIFrame* prevSibling = ::FindAppendPrevSibling(parentFrame, nextSibling);
 
   // Perform special check for diddling around with the frames in
   // a ib-split inline frame.
@@ -7536,8 +7456,11 @@ nsCSSFrameConstructor::ContentAppended(nsIContent*     aContainer,
         !prevSibling->IsInlineOutside() ||
         prevSibling->GetType() == nsGkAtoms::brFrame);
     // :after content can't be <br> so no need to check it
-    items.SetLineBoundaryAtEnd(!parentAfterFrame ||
-        !parentAfterFrame->IsInlineOutside());
+    //
+    // FIXME(emilio): A display: contents sibling could! Write a test-case and
+    // fix.
+    items.SetLineBoundaryAtEnd(
+        !nextSibling || !nextSibling->IsInlineOutside());
   }
   // To suppress whitespace-only text frames, we have to verify that
   // our container's DOM child list matches its flattened tree child list.