Bug 1600542 - Remove a few other no longer reachable XUL box special-cases. r=TYLin

The only XUL frames that remain are either scrollbars, or leafs. These are uses
that I'm pretty sure are no longer needed. There are a few others that will go
in the future.

Depends on D172874

Differential Revision: https://phabricator.services.mozilla.com/D172875

layout/base/PresShell.cpp

@@ -11513,15 +11513,6 @@ PresShell::WindowSizeConstraints PresShell::GetWindowSizeConstraints() {
   if (!rootFrame || !mPresContext) {
     return {minSize, maxSize};
   }
-  if (rootFrame->IsXULBoxFrame()) {
-    UniquePtr<gfxContext> rcx(CreateReferenceRenderingContext());
-    if (!rcx) {
-      return {minSize, maxSize};
-    }
-    nsBoxLayoutState state(mPresContext, rcx.get());
-    minSize = rootFrame->GetXULMinSize(state);
-    maxSize = rootFrame->GetXULMaxSize(state);
-  } else {
   const auto* pos = rootFrame->StylePosition();
   if (pos->mMinWidth.ConvertsToLength()) {
     minSize.width = pos->mMinWidth.ToLength();
@@ -11535,7 +11526,6 @@ PresShell::WindowSizeConstraints PresShell::GetWindowSizeConstraints() {
   if (pos->mMaxHeight.ConvertsToLength()) {
     maxSize.height = pos->mMaxHeight.ToLength();
   }
-  }
   return {minSize, maxSize};
 }
 

layout/base/RestyleManager.cpp

@@ -965,15 +965,6 @@ static bool RecomputePosition(nsIFrame* aFrame) {
   return false;
 }
 
-static bool HasBoxAncestor(nsIFrame* aFrame) {
-  for (nsIFrame* f = aFrame; f; f = f->GetParent()) {
-    if (f->IsXULBoxFrame()) {
-      return true;
-    }
-  }
-  return false;
-}
-
 /**
  * Return true if aFrame's subtree has placeholders for out-of-flow content
  * that would be affected due to the change to
@@ -1285,11 +1276,6 @@ static void StyleChangeReflow(nsIFrame* aFrame, nsChangeHint aHint) {
     dirtyType = IntrinsicDirty::FrameAncestorsAndDescendants;
   } else if (aHint & nsChangeHint_ClearAncestorIntrinsics) {
     dirtyType = IntrinsicDirty::FrameAndAncestors;
-  } else if ((aHint & nsChangeHint_UpdateComputedBSize) &&
-             HasBoxAncestor(aFrame)) {
-    // The frame's computed BSize is changing, and we have a box ancestor
-    // whose cached intrinsic height may need to be updated.
-    dirtyType = IntrinsicDirty::FrameAndAncestors;
   } else {
     dirtyType = IntrinsicDirty::None;
   }

layout/tables/BasicTableLayoutStrategy.cpp

@@ -603,23 +603,6 @@ void BasicTableLayoutStrategy::DistributePctISizeToColumns(float aSpanPrefPct,
   }
 }
 
-#ifdef DEBUG
-// Bypass some assertions for tables inside XUL which we're realistically not
-// going to investigate unless they cause havoc. Thunderbird hits these very
-// often.
-static bool IsCloseToXULBox(nsTableFrame* aTableFrame) {
-  // NOTE: GetParent() is guaranteed to be the table wrapper (thus non-null).
-  nsIFrame* f = aTableFrame->GetParent()->GetParent();
-  for (size_t i = 0; f && i < 2; ++i) {
-    if (f->IsXULBoxFrame()) {
-      return true;
-    }
-    f = f->GetParent();
-  }
-  return false;
-}
-#endif
-
 void BasicTableLayoutStrategy::DistributeISizeToColumns(
     nscoord aISize, int32_t aFirstCol, int32_t aColCount,
     BtlsISizeType aISizeType, bool aSpanHasSpecifiedISize) {
@@ -776,8 +759,7 @@ void BasicTableLayoutStrategy::DistributeISizeToColumns(
       // Return early -- we don't have any extra space to distribute.
       return;
     }
-    NS_ASSERTION(!(aISizeType == BTLS_FINAL_ISIZE && aISize < guess_min) ||
+    NS_ASSERTION(!(aISizeType == BTLS_FINAL_ISIZE && aISize < guess_min),
-                     IsCloseToXULBox(mTableFrame),
                  "Table inline-size is less than the "
                  "sum of its columns' min inline-sizes");
     if (aISize < guess_min_pct) {
@@ -1007,13 +989,9 @@ void BasicTableLayoutStrategy::DistributeISizeToColumns(
       } break;
     }
   }
-#ifdef DEBUG
+  NS_ASSERTION(
-  if (!IsCloseToXULBox(mTableFrame)) {
+      (space == 0 || space == nscoord_MAX) &&
-    NS_ASSERTION((space == 0 || space == nscoord_MAX) &&
+          ((l2t == FLEX_PCT_LARGE) ? (-0.001f < basis.f && basis.f < 0.001f)
-                     ((l2t == FLEX_PCT_LARGE)
-                          ? (-0.001f < basis.f && basis.f < 0.001f)
                                    : (basis.c == 0 || basis.c == nscoord_MAX)),
       "didn't subtract all that we added");
-  }
-#endif
 }