Record space shortage that prevented an object from fitting in one column.

third_party/WebKit/Source/core/layout/ColumnBalancer.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 
 #include "core/layout/ColumnBalancer.h"
 
 #include "core/layout/LayoutMultiColumnSet.h"
 
@@ skipping 228 matching lines @@
     if (box.hasForcedBreakAfter())
         m_forcedBreaksCount++;
 
     // Look for breaks before the child box.
     bool isFirstAfterBreak = this->isFirstAfterBreak(flowThreadOffset());
     ASSERT(isFirstAfterBreak || !box.paginationStrut());
     LayoutBox::PaginationBreakability breakability = box.paginationBreakability();
     if (isFirstAfterBreak && !box.hasForcedBreakBefore()) {
         // This box is first after a soft break.
         LayoutUnit strut = box.paginationStrut();
-        if (breakability == LayoutBox::ForbidBreaks) {
-            // Since we cannot break inside the box, just figure out how much more space we would
-            // need to prevent it from being pushed to the next column.
-            recordSpaceShortage(box.logicalHeight() - strut);
-        } else if (m_pendingStrut == LayoutUnit::min()) {
+        // Figure out how much more space we would need to prevent it from being pushed to the next column.
+        recordSpaceShortage(box.logicalHeight() - strut);
+        if (breakability != LayoutBox::ForbidBreaks && m_pendingStrut == LayoutUnit::min()) {
             // We now want to look for the first piece of unbreakable content (e.g. a line or a
             // block-displayed image) inside this block. That ought to be a good candidate for
             // minimum space shortage; a much better one than reporting space shortage for the
             // entire block (which we'll also do (further down), in case we couldn't find anything
             // more suitable).
             m_pendingStrut = strut;
         }
     }
 
     if (breakability != LayoutBox::ForbidBreaks) {
@@ skipping 37 matching lines @@
         recordSpaceShortage(logicalOffsetFromCurrentColumn + lineHeight - m_pendingStrut);
         m_pendingStrut = LayoutUnit::min();
         return;
     }
     ASSERT(isFirstAfterBreak(lineTopInFlowThread) || !line.paginationStrut());
     if (isFirstAfterBreak(lineTopInFlowThread))
         recordSpaceShortage(lineHeight - line.paginationStrut());
 }
 
 } // namespace blink