Bug 1942715: Part 5 - Remove Maybe* optimizations for insets, always working with anchor-resolved insets. r=firefox-style-system-reviewers,emilio

Reasoning with these functions gets confusing, because anchor
functions can become percentage as well as auto.
Defer optimization for now.

Differential Revision: https://phabricator.services.mozilla.com/D237098

layout/generic/ReflowInput.cpp

@@ -736,15 +736,19 @@ void ReflowInput::InitResizeFlags(nsPresContext* aPresContext,
                    ComputedLogicalBorderPadding(wm).BStartEnd(wm));
   }
 
+  const auto positionProperty = mStyleDisplay->mPosition;
   bool dependsOnCBBSize =
       (mStylePosition->BSizeDependsOnContainer(wm) &&
        // FIXME: condition this on not-abspos?
        !mStylePosition->BSize(wm).IsAuto()) ||
       mStylePosition->MinBSizeDependsOnContainer(wm) ||
       mStylePosition->MaxBSizeDependsOnContainer(wm) ||
-      mStylePosition->mOffset.Get(LogicalSide::BStart, wm)
-          .MaybePercentageAware() ||
-      !mStylePosition->mOffset.Get(LogicalSide::BEnd, wm).MaybeAuto();
+      mStylePosition
+          ->GetAnchorResolvedInset(LogicalSide::BStart, wm, positionProperty)
+          ->HasPercent() ||
+      !mStylePosition
+           ->GetAnchorResolvedInset(LogicalSide::BEnd, wm, positionProperty)
+           ->IsAuto();
 
   // If mFrame is a flex item, and mFrame's block axis is the flex container's
   // main axis (e.g. in a column-oriented flex container with same